Adding option to eval to prevent distribution over arrays and dicts.

[cmungall]

Previously the eval function in eval_utils auto-distributes over
many-valued options. This allows for this to be controlled.

For example, in this case when looking up an object, we want to avoid
distribution:

• pd = dict(name='x', aliases=['a', 'b', 'c'], address=Address(street='1 x street'))
• assert eval_expr('p.name', p=pd, _distribute=False) == 'x'

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 63.46%. Comparing base (1b5e9f7) to head (c03e72d).
Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
linkml_runtime/utils/eval_utils.py	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #365      +/-   ##
==========================================
+ Coverage   63.43%   63.46%   +0.02%     
==========================================
  Files          63       63              
  Lines        8982     8982              
  Branches     2574     2573       -1     
==========================================
+ Hits         5698     5700       +2     
+ Misses       2665     2664       -1     
+ Partials      619      618       -1     

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[amc-corey-cox]

This looks good to me!