refactor(exceptions): update JavaError's inner_exception type

[cesarcoatl]

make it Optional

Summary by Sourcery

Enhancements:

• Relax the type of JavaError.inner_exception and constructors (including GatewayError and MSSQLError) to Optional[InnerException] in both implementation and stubs for better typing accuracy.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Refactors the JavaError and its subclasses so that inner_exception is consistently typed as Optional[InnerException] in both runtime code and type stubs, aligning the default None value with the type hints.

File-Level Changes

Change	Details	Files
Make JavaError.inner_exception and related constructor parameters Optional to match default None and improve type correctness.	Change JavaError.inner_exception class attribute type from InnerException to Optional[InnerException] in the implementation. Update JavaError.init signature so inner_exception parameter is typed as Optional[InnerException] in the implementation. Update GatewayError.init and MSSQLError.init signatures so inner_exception parameters are typed as Optional[InnerException] in the implementation. Update the .pyi stubs for JavaError, GatewayError, and MSSQLError so inner_exception attributes and constructor parameters are typed as Optional[InnerException].	src/incendium/exceptions.py stubs/stubs/incendium/exceptions.pyi

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[sourcery-ai]

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