Feature/textgrid allow list

[MartinKl]

• enable user to define the order of tiers in textgrid export using tier_order (a list of annotation keys)
• use said list as allowlist for overall tiers by setting ignore_others to true

[codecov[bot]]

Codecov Report

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

Project coverage is 81.64%. Comparing base (4ae6d58) to head (35d96fd).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #265 +/- ## ========================================== + Coverage 81.37% 81.64% +0.26% ========================================== Files 41 41 Lines 14482 14646 +164 Branches 14482 14646 +164 ========================================== + Hits 11785 11958 +173 + Misses 1043 1029 -14 - Partials 1654 1659 +5 ```

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