New version of agent macro

[Tortar]

Per #869

e.g. this now works

abstract type Foo end
@agent struct NewAgent(GridAgent{2}) <: Foo
    x::Int = 1
    const y::Int
end

[codecov-commenter]

Codecov Report

Merging #870 (96488cf) into main (abca390) will increase coverage by 0.96%.
Report is 6 commits behind head on main.
The diff coverage is 82.60%.

@@            Coverage Diff             @@
##             main     #870      +/-   ##
==========================================
+ Coverage   71.76%   72.72%   +0.96%     
==========================================
  Files          42       42              
  Lines        2745     2871     +126     
==========================================
+ Hits         1970     2088     +118     
- Misses        775      783       +8     

Files Changed	Coverage Δ
src/Agents.jl	100.00% <ø> (ø)
src/deprecations.jl	2.00% <0.00%> (-0.33%)	⬇️
src/simulations/sample.jl	100.00% <ø> (ø)
src/spaces/continuous.jl	92.30% <ø> (-0.96%)	⬇️
src/spaces/graph.jl	76.19% <ø> (ø)
src/spaces/grid_general.jl	99.16% <ø> (+0.32%)	⬆️
src/spaces/openstreetmap.jl	72.30% <ø> (ø)
src/core/agents.jl	100.00% <100.00%> (+7.69%)	⬆️
src/core/space_interaction_API.jl	93.07% <100.00%> (+0.76%)	⬆️

... and 14 files with indirect coverage changes

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