Single-tenant support

[anesvijskij]

This pull request updates the AcuMate VS Code extension to version 1.0.1, focusing on improving support for single-tenant Acumatica instances. The main change is that the acuMate.tenant setting is no longer required, allowing users of single-tenant sites to leave it empty without blocking backend-powered features. Documentation and user-facing descriptions have also been updated for clarity.

Single-tenant support improvements:

• Removed the requirement for acuMate.tenant in backend configuration checks, so single-tenant users can leave it empty without warnings or errors.
• When authenticating, the tenant field is now only sent if it is non-empty, preventing issues with empty values.

Documentation and metadata updates:

• Updated the acuMate.tenant setting description in both package.json and readme.md to clarify that it can be left empty for single-tenant sites. [1] [2]
• Added a changelog entry for version 1.0.1, highlighting the removal of the tenant requirement.
• Bumped the extension version to 1.0.1 in package.json.