#290 - Speedup load_cas_from_xmi by improving offset mapping

[DavidHuebner]

1. Added an LRU Cache for speeding up the encode function and refactored the create_offset_mapping
2. When reading a CAS-XMI, directly pass down the offset mappings to avoid recomputing them.

Reduced the time spent in create_offset_mapping from 49% to 8%.

[codecov[bot]]

Codecov Report

Merging #291 (970a6b7) into main (4dda3bd) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
- Coverage   95.12%   95.11%   -0.01%     
==========================================
  Files           5        5              
  Lines        1968     1966       -2     
==========================================
- Hits         1872     1870       -2     
  Misses         96       96              

Files Changed	Coverage Δ
cassis/cas.py	95.67% <100.00%> (-0.04%)	:arrow_down:
cassis/xmi.py	96.72% <100.00%> (+<0.01%)	:arrow_up:

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[reckart]

Thanks for the PR :)