feat: Add Amazon Redshift adapter (Fixes #118)

[ZAK1504]

Issue

Fixes #118

Summary

Implements a complete Amazon Redshift adapter for Intugle, resolving the Help Wanted issue.

Changes

• RedshiftAdapter class with full Adapter interface implementation
• Pydantic models for Redshift configuration and connection settings
• Data profiling support via profile() and column_profile()
• Query execution with execute(), to_df(), and to_df_from_query()
• Relationship analysis including intersect_count() and composite key uniqueness
• SQL transpilation using sqlglot for dialect compatibility
• Factory registration with optional dependency handling

Testing

• 10/10 stress tests passed
• Unit tests with mocking (10 test cases)
• No syntax or import errors
• Follows same pattern as existing optional adapters (Snowflake, MySQL, Databricks)

Dependencies

Optional dependencies added to pyproject.toml:

• redshift-connector>=2.1.0
• sqlglot>=27.20.0

Documentation

• Comprehensive README with configuration examples
• 7 usage examples in examples/redshift_adapter_example.py

Files Changed

• 8 files changed, 945 insertions
• 2 modified: factory.py, pyproject.toml
• 6 new files in src/intugle/adapters/types/redshift/ and tests

[ZAK1504]

heyyy @raphael-intugle !...i had been working on this for few days...so please let me know if everything is alright...

[raphael-intugle]

Nice work @ZAK1504 . I'll take a look into it soon