Remove x12 delimiter from segment group and segment data models

[dixonwhitmire]

This PR removes the "delimiters" field from the X12SegmentGroup and X12Segment models. "delimiters" are removed as there aren't part of the data payload, but rather metadata which drives x12 output and transformation.

(venv) mbp x12 % lfhx12 -m -p -x  demo-file/demo.270
[
    {
        "header": {
            "st_segment": {
                "segment_name": "ST",
                "transaction_set_identifier_code": "270",
                "transaction_set_control_number": "1234",
                "implementation_convention_reference": "005010X279A1"
            },
            "bht_segment": {
                "segment_name": "BHT",
                "hierarchical_structure_code": "0022",
                "transaction_set_purpose_code": "13",
                "submitter_transactional_identifier": "10001234",
                "transaction_set_creation_date": "2006-05-01",
                "transaction_set_creation_time": "1319"
            }
        },
        "loop_2000a": [
            {
                "hl_segment": {
                    "segment_name": "HL",
                    "hierarchical_id_number": "1",
                    "hierarchical_level_code": "20",
                    "hierarchical_child_code": "1"
                },
                "loop_2100a": {
                    "nm1_segment": {
                        "segment_name": "NM1",
                        "entity_identifier_code": "PR",
                        "entity_type_qualifier": "2",
                        "name_last_or_organization_name": "ABC COMPANY",
                        "identification_code_qualifier": "PI",
                        "identification_code": "842610001"
                    }
                },
                "loop_2000b": [
                    {
                        "hl_segment": {
                            "segment_name": "HL",
                            "hierarchical_id_number": "2",
                            "hierarchical_parent_id_number": "1",
                            "hierarchical_level_code": "21",
                            "hierarchical_child_code": "1"
                        },
                        "loop_2100b": {
                            "nm1_segment": {
                                "segment_name": "NM1",
                                "entity_identifier_code": "1P",
                                "entity_type_qualifier": "2",
                                "name_last_or_organization_name": "BONE AND JOINT CLINIC",
                                "identification_code_qualifier": "SV",
                                "identification_code": "2000035"
                            },
                            "ref_segment": []
                        },
                        "loop_2000c": [
                            {
                                "hl_segment": {
                                    "segment_name": "HL",
                                    "hierarchical_id_number": "3",
                                    "hierarchical_parent_id_number": "2",
                                    "hierarchical_level_code": "22",
                                    "hierarchical_child_code": "0"
                                },
                                "trn_segment": [
                                    {
                                        "segment_name": "TRN",
                                        "trace_type_code": "1",
                                        "reference_identification_1": "93175-012547",
                                        "originating_company_identifier": "9877281234"
                                    }
                                ],
                                "loop_2100c": {
                                    "nm1_segment": {
                                        "segment_name": "NM1",
                                        "entity_identifier_code": "IL",
                                        "entity_type_qualifier": "1",
                                        "name_last_or_organization_name": "SMITH",
                                        "name_first": "ROBERT",
                                        "identification_code_qualifier": "MI",
                                        "identification_code": "11122333301"
                                    },
                                    "ref_segment": [],
                                    "dmg_segment": {
                                        "segment_name": "DMG",
                                        "date_time_period_format_qualifier": "D8",
                                        "date_time_period": "1943-05-19"
                                    },
                                    "dtp_segment": {
                                        "segment_name": "DTP",
                                        "date_time_qualifier": "291",
                                        "date_time_period_format_qualifier": "D8",
                                        "date_time_period": "2006-05-01"
                                    },
                                    "loop_2110c": {
                                        "eq_segment": {
                                            "segment_name": "EQ",
                                            "service_type_code": [
                                                "30"
                                            ]
                                        },
                                        "amt_segment": []
                                    }
                                }
                            }
                        ]
                    }
                ]
            }
        ],
        "footer": {
            "se_segment": {
                "segment_name": "SE",
                "transaction_segment_count": 13,
                "transaction_set_control_number": "1234"
            }
        }
    }
]

The X12SegmentGroup.x12() method now supports a custom_delimiters parameter which allows a client to pass customer delimiters if needed

    with X12ModelReader(x12_with_custom_delimiters) as r:
        model_result = [m for m in r.models()]
        assert len(model_result) == 1
        assert (
            model_result[0].x12(custom_delimiters=x12_delimiters)
            == expected_transaction
        )

Signed-off-by: Dixon Whitmire dixonwh@gmail.com
closes #35