Migrate nevergrad optimizers to new documentation style

[gauravmanmode]

PR Description

This PR updates the documentation of the recently added optimizers from the nevergrad library to follow the new documentation style.

Additional changes

Clarify dependancy conflict between nevergrad and bayes_opt
Closes #627
Use tab-set directive instead of tabbed
Closes #628
Also, use from __future__ import annotations in nevergrad_optimizers.py for stringified annotations.

[janosg]

@gauravmanmode can you update this branch and fix the merge conflicts?

[gauravmanmode]

Sure, I have a few things left to do here and then I will fix the merge conflicts

[codecov]

Codecov Report

❌ Patch coverage is 99.28571% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/optimagic/optimizers/nevergrad_optimizers.py	99.26%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/optimagic/config.py	100.00% <100.00%> (ø)
src/optimagic/optimizers/bayesian_optimizer.py	91.59% <100.00%> (ø)
src/optimagic/optimizers/nevergrad_optimizers.py	77.08% <99.26%> (+10.52%)	⬆️

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[gauravmanmode]

@janosg, I have fixed the merge conflicts.

[janosg]

Very nice. Just minor comments.

[gauravmanmode]

Sorry for the delay. I reverted new changes.
@janosg this is ready for review and merge.

[janosg]

Thanks @gauravmanmode !