RecordsQuery & RecordsSubscribe supports an array for `author` and `recipient`

[LiranCohen]

Introduce filtering by multiple authors or recipients. The filters are backward compatible, so that author and recipient filters now accept a string or Array<string>.

NOTE: If an empty array is passed into the filter, it is treated as an undefined filter.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.63%. Comparing base (8d574ed) to head (c06f76a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #777 +/- ## ======================================= Coverage 98.62% 98.63% ======================================= Files 73 73 Lines 11293 11335 +42 Branches 1616 1628 +12 ======================================= + Hits 11138 11180 +42 Misses 149 149 Partials 6 6 ```

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