#12 Implement timestamp and enum types handling

[IlyaLisov]

close #12

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PR-Codex overview

This PR adds functionality to handle Postgres types and format timestamps, as well as minor updates to improve code quality.

Detailed summary

• Added getColumnType method to PostgresRepository to handle Postgres types
• Added timeFormat property to Node class and CSVNeo4jUploader to format timestamps
• Updated PostgresRepositoryImpl to use LinkedHashMap instead of HashMap
• Updated Node class to handle Postgres types and format timestamps
• Updated CSVNeo4jUploader to handle types and timeFormat parameters

The following files were skipped due to too many changes: src/main/java/com/example/postgresneo4jmigrationtool/parser/XmlParser.java

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