fix(amazon q): add pl/1 and bms extensions as a recognized code file type

[scottwritescode]

Problem

The codefileExtensions does not contain an extension type for .pli which is the common extension for PL/1, or for .bms which is Basic Mapping Support and common for screen definition files in IBM mainframe. Because of this, the files and code in them are not accessible in the workspace context for Amazon Q using the /dev quick action.

When using the Q quick action '\dev' for .pli or .bms files, Q responds with the following message

This appears to be an empty program or workspace with no source files present. There is nothing to explain at this time since no code or files are available for analysis.

Solution

• Add the PL/1 language extension .pli as a known code file extension type
• Add the Basic Mapping Support extension .bms as a known code file extension type

No tests were updated as there are none exclusively for filetype extensions

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License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.