Update multistart option handling

[timmens]

In this PR, I update the multistart options handing.

• [x] Add public MultistartOptions data class
• [x] Add internal MultistartInfo data class
• [x] Add a lot of type and value checks to the public data class
• [x] Add deprecations and exceptions
• [x] Only use MultistartOptions instead of dictionaries internally
• [x] Add deprecation test
• [x] Change default "sampling_method" to "random".
• [x] Validate that RNG can be used as seeds.

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Codecov Report

Attention: Patch coverage is 94.92188% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/optimagic/optimization/multistart_options.py	95.62%	7 Missing :warning:
...imagic/optimization/create_optimization_problem.py	72.72%	3 Missing :warning:
src/optimagic/optimization/multistart.py	92.59%	2 Missing :warning:
src/optimagic/optimization/optimize_result.py	92.30%	1 Missing :warning:

Files with missing lines	Coverage Δ
src/optimagic/__init__.py	100.00% <100.00%> (+10.00%)	:arrow_up:
src/optimagic/deprecations.py	100.00% <100.00%> (ø)
src/optimagic/exceptions.py	86.66% <100.00%> (+0.45%)	:arrow_up:
src/optimagic/optimization/optimize.py	91.73% <100.00%> (+1.59%)	:arrow_up:
src/optimagic/optimization/process_results.py	96.10% <100.00%> (-0.05%)	:arrow_down:
src/optimagic/parameters/scaling.py	97.22% <100.00%> (+0.34%)	:arrow_up:
src/optimagic/optimization/optimize_result.py	93.89% <92.30%> (-0.28%)	:arrow_down:
src/optimagic/optimization/multistart.py	92.56% <92.59%> (+0.11%)	:arrow_up:
...imagic/optimization/create_optimization_problem.py	84.74% <72.72%> (-0.32%)	:arrow_down:
src/optimagic/optimization/multistart_options.py	95.62% <95.62%> (ø)

... and 1 file with indirect coverage changes