Added pruner option to TFT optimize_hyperparameters-method

[TKlerx]

Description

Add possibility to change pruner for optimize_hyperparameters in TFT according to #589

Checklist

• Linked issues (if existing)
• Amended changelog for large changes (and added myself there as contributor): Not a big change :)
• Added/modified tests: Not necessary, I guess.
• Used pre-commit hooks when committing to ensure that code is compliant with hooks. Install hooks with pre-commit install.
  To run hooks independent of commit, execute pre-commit run --all-files

[jdb78]

Thanks a lot! This is indeed a useful addition. Could you amend the changelog and add your name to it?

[codecov-commenter]

Codecov Report

Merging #619 (4df581e) into master (b3da0c1) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #619      +/-   ##
==========================================
+ Coverage   89.87%   89.89%   +0.01%     
==========================================
  Files          24       24              
  Lines        3714     3710       -4     
==========================================
- Hits         3338     3335       -3     
+ Misses        376      375       -1     

Flag	Coverage Δ
cpu	89.89% <ø> (+0.01%)	⬆️
pytest	89.89% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...sting/models/temporal_fusion_transformer/tuning.py	96.77% <ø> (-0.06%)	⬇️
.../models/temporal_fusion_transformer/sub_modules.py	86.26% <0.00%> (-0.10%)	⬇️
pytorch_forecasting/models/basic_rnn/__init__.py	0.00% <0.00%> (ø)

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[TKlerx]

Hey Jan,

Thanks for integrating this PR.
Changelog amended. I hope the description ok.

Timo