12 add event subscription mechanism

[ndouglas]

No description provided.

[codecov]

Codecov Report

Merging #13 (a9f241c) into main (546a61f) will increase coverage by 8.09%.
The diff coverage is 52.70%.

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   49.37%   57.46%   +8.09%     
==========================================
  Files          27       38      +11     
  Lines         399      750     +351     
==========================================
+ Hits          197      431     +234     
- Misses        202      319     +117     

Files	Coverage Δ
src/event/tag/mod.rs	100.00% <100.00%> (ø)
src/game_state/_impl/_list/command_queue/mod.rs	100.00% <100.00%> (ø)
src/game_state/_impl/_list/event_queue/mod.rs	100.00% <100.00%> (ø)
src/game_state/_impl/_list/loop_timer/mod.rs	100.00% <100.00%> (ø)
src/lib.rs	100.00% <ø> (ø)
src/entity_id/_type/_list/base_id/mod.rs	0.00% <0.00%> (ø)
src/event/filter_rule/mod.rs	96.87% <96.87%> (ø)
src/event/mod.rs	93.75% <93.75%> (ø)
src/game_state/mod.rs	81.81% <85.71%> (-8.19%)	⬇️
src/system/_list/input/mod.rs	0.00% <0.00%> (ø)
... and 21 more

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