feat: enable filter by variable name in mp filter series

[allanbowe]

Issue

368

https://git.datacontroller.io/dc/dc/issues/68

Intent

Enables variable names as well as values in the filter macros

Implementation

Update to filter checks

Checks

• [x] Code is formatted correctly (sasjs lint).
• [x] Any new functionality has been unit tested.
• [x] All unit tests are passing (sasjs test).
• [x] The PR desc or underlying commits follow the Conventional Commit standard

[github-actions[bot]]

:tada: This PR is included in version 4.49.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: