Python: Pydantic settings config

[eavanvalkenburg]

Motivation and Context

The initial implementation of Pydantic Settings was not optimal yet, more optimized now.

Description

Added a KernelBaseSettings class in kernel_pydantic
Rebased all settings off that
Added single create method to KernelBaseSettings:

• sets model_config.env_prefix to cls.end_prefix allowing us to set the env_prefix as a classvar on each subclass and it works
• if env_file_path is set, set that in model_config
• strip all None values out of inputted values, then instantiate

This also allows us to pass the settings that are supplied to the settings class, for overriding env settings.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[markwallace-microsoft]

Python 3.10 Test Coverage Report •

File	Stmts	Miss	Cover	Missing
semantic_kernel
kernel_pydantic.py	21	1	95%	51
semantic_kernel/connectors/ai/google_palm/services
gp_chat_completion.py	69	16	77%	68, 155–160, 172–173, 212, 215, 218–219, 227, 231–232, 240
gp_text_completion.py	41	6	85%	55, 79–80, 86–87, 122
gp_text_embedding.py	34	5	85%	54, 65–66, 75–76
semantic_kernel/connectors/ai/open_ai/prompt_execution_settings
azure_chat_prompt_execution_settings.py	66	3	95%	89–96, 109
semantic_kernel/connectors/ai/open_ai/services
azure_chat_completion.py	87	34	61%	141, 147–148, 157–158, 163–180, 184–191, 203–214
open_ai_chat_completion.py	23	1	96%	61
open_ai_text_completion.py	25	2	92%	61, 80
open_ai_text_embedding.py	24	4	83%	59–60, 62, 80
semantic_kernel/connectors/search_engine
bing_connector.py	33	33	0%	3–74
bing_connector_settings.py	6	6	0%	3–25
semantic_kernel/core_plugins/sessions_python_tool
sessions_python_plugin.py	103	14	86%	59–61, 81, 84, 89–95, 135, 182, 186
TOTAL	6058	858	86%

Python 3.10 Unit Test Overview

Tests	Skipped	Failures	Errors	Time
1396	1 💤	0 ❌	0 🔥	16.558s ⏱️