fix (RedisRegistry): avoid overwriting cache with the same key during load

[ab93]

• fix cache key overwrite issue which caused a stale model to persist for a long time
• Save sourcetype in artifact data extras to be used for other logic
• Improve docs

[codecov[bot]]

Codecov Report

Merging #223 (de953f9) into main (0b0daed) will decrease coverage by 0.14%. The diff coverage is 100.00%.

:exclamation: Current head de953f9 differs from pull request most recent head 6c3ae5f. Consider uploading reports for the commit 6c3ae5f to get more accurate results

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
- Coverage   96.29%   96.15%   -0.14%     
==========================================
  Files          46       46              
  Lines        1942     1953      +11     
  Branches      155      157       +2     
==========================================
+ Hits         1870     1878       +8     
- Misses         52       54       +2     
- Partials       20       21       +1     

Impacted Files	Coverage Δ
numalogic/registry/artifact.py	92.00% <100.00%> (+0.33%)	:arrow_up:
numalogic/registry/localcache.py	96.00% <100.00%> (+1.55%)	:arrow_up:
numalogic/registry/redis_registry.py	97.67% <100.00%> (+0.03%)	:arrow_up:

... and 1 file with indirect coverage changes

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