Move vended_tools under src

[zastrowm]

Description

Consolidate all source code under the src directory for better organization.

This moves vended tools under src/vended-tools keeping the vended_tools export for customers & backwards compatibility. I updated our eslint config to ensure that nothing outside of vended_tools references our vended_tools.

I named it src/vended-tools instead of src/vended_tools because it matches our other folders like conversation-manager (IMHO dashes are more common/better for JS projects). Externally it's still vended_tools - I have/had a plan to migrate to vended-tools there as well, but want to discuss with the team first.

Testing

As part of this change, I added code to our test:package to ensure that consumers can access these tools. The test(s) pass both before & after this change.

We also now export the Tool class; it was previously a type only export, but that was a left over artifact from when Tool was interface and was never updated when we made it a base class.

Related Issues

Documentation PR

Type of Change

Refactor

Testing

How have you tested the change?

• I ran npm run check

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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[afarntrog]

We need to update this file as well
https://github.com/strands-agents/sdk-typescript/blob/ce4ed15fcdfcf2eae5407aeb64ffc535d9ea51f3/vitest.config.ts