remove use of lazy_static

[oll3]

Seemed overkill to include lazy_static for a single, short lookup map. Hence replaced the implementation with a static array. Guessing its about the same performance wise, or faster, for short lists like these.

[codecov]

Codecov Report

Merging #20 (3b23c96) into main (e4f16f4) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main      #20   +/-   ##
=======================================
  Coverage   46.25%   46.25%           
=======================================
  Files          75       75           
  Lines        8646     8646           
  Branches     1881     1885    +4     
=======================================
  Hits         3999     3999           
+ Misses       3513     3512    -1     
- Partials     1134     1135    +1     

Impacted Files	Coverage Δ
src/conn/conn_test.rs	72.89% <0.00%> (ø)
src/lib.rs	19.69% <ø> (ø)
src/state.rs	69.56% <100.00%> (ø)

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