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[AB#34909](https://sqlclientdrivers.visualstudio.com/c6d89619-62de-46a0-8b46-70b92a84d85e/_workitems/edit/34909)

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### Summary   
This pull request adds a new `searchescape` property to the `Connection`
class in `mssql_python`, which exposes the ODBC search pattern escape
character used for escaping special characters in SQL LIKE clauses. It
also introduces comprehensive tests to ensure correct and consistent
behavior of this property, including its use in various SQL queries and
its caching mechanism.

Enhancements to connection escape character handling:

* Added a `searchescape` property to the `Connection` class in
`connection.py`, which retrieves and caches the ODBC search pattern
escape character using `SQLGetInfo`, with sensible defaults and error
handling.
* Imported `GetInfoConstants` in `connection.py` to support the new
property.

Testing improvements:

* Added multiple tests in `test_003_connection.py` to verify the
`searchescape` property's basic functionality, its use in SQL LIKE
queries (with `%`, `_`, and bracket wildcards), multiple escape
scenarios, and property consistency and caching.

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Co-authored-by: Jahnvi Thakkar <jathakkar@microsoft.com>