[perf] Use yamllib if available

[sneakers-the-rat]

Loading yaml is actually really slow in pure python! and we load a lot of yaml!

There's a free perf boost we can get by just using the compiled yamllib versions if they are available (they usually are).

The only failure I noticed was that there was a single \t character at the start of a multiline string in the biolink model that cause s parsing error, but once that was fixed it was exactly the same just way faster.

For YAMLLoader.load_as_dict in main linkml tests, (cumulative time in seconds, --with-slow)

	Total test time	load_as_dict	per call
Before PR	1527s	451.3s	.1136s
This PR	1334s	243.9s	.062s
Change.	-193s	-207s	-.0516
Change:	-12.6%	-46%

all ~ for free ~

Same as #307 , i have no idea why these tests are failing. i didn't touch anything near that test, and this is a totally orthogonal change to 307 having the same error, and one of the tests here miraculously passed, so i think this is a flaky test rather than anything I did.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.90%. Comparing base (27b9158) to head (82fcfa6).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #306      +/-   ##
==========================================
+ Coverage   62.88%   62.90%   +0.01%     
==========================================
  Files          62       62              
  Lines        8528     8532       +4     
  Branches     2436     2436              
==========================================
+ Hits         5363     5367       +4     
  Misses       2554     2554              
  Partials      611      611              

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[cmungall]

thx!

Looks like one failing test

We also want to consider whether to incorporate ruamel.yaml into our strategy. We use it in some places as it has nice features like comment preservations (very useful for diff/patch workflows). Not sure how it compares on performance

https://yaml.readthedocs.io/en/latest/pyyaml/

We currently have incomplete behavior with decimals using pyyaml:
yaml/pyyaml#255

See test_type_range in the compliance tests