Fix table indices in Memory64Lowering

[Sree24-ui]

Summary
Handle table.get and table.set indices in Memory64Lowering, wrapping 64-bit table indices when lowering the table address type.
Add regression coverage for constant, dynamic, and nested indices, as well as 32-bit table operations.
Testing

• git diff --check passed.
• The focused lit test was attempted, but could not complete because filecheck is unavailable in the local environment.
  AI assistance was used during development and review.

[gemini-code-assist]

Code Review

This pull request implements memory64 lowering for table.get and table.set instructions by adding visitTableGet and visitTableSet methods to the Memory64Lowering pass, which wrap the table index using wrapTableAddress64. It also adds comprehensive lit tests to verify the correct wrapping behavior for 64-bit tables and ensure 32-bit tables remain unaffected. There are no review comments to evaluate, and the implementation appears correct.