rework Spawn() to take purely a map[string]any, a slightly better pattern

[codecov[bot]]

Codecov Report

Merging #46 (4cba1f6) into master (fcf3e1f) will decrease coverage by 0.15%. The diff coverage is 76.66%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage   72.59%   72.44%   -0.15%     
==========================================
  Files          56       56              
  Lines        2288     2341      +53     
==========================================
+ Hits         1661     1696      +35     
- Misses        572      581       +9     
- Partials       55       64       +9     

Impacted Files	Coverage Δ
v2/entity.go	47.54% <36.36%> (+1.77%)	:arrow_up:
v2/entity_manager_spawn.go	70.09% <66.30%> (-7.27%)	:arrow_down:
v2/func_set.go	46.15% <80.00%> (+9.79%)	:arrow_up:
v2/testing_spawn_requests.go	92.98% <92.85%> (+0.52%)	:arrow_up:
v2/component_set.go	68.42% <100.00%> (ø)
v2/component_table.go	48.64% <100.00%> (ø)
v2/entity_table.go	100.00% <100.00%> (ø)
v2/testing_world.go	100.00% <100.00%> (ø)
v2/world.go	85.05% <100.00%> (ø)
v2/world_entity_manager_proxy.go	95.74% <100.00%> (+3.58%)	:arrow_up:
... and 1 more

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