Refactor and Cleanup

[Sid-Bhatia-0]

1. import instead of using packages
   1. Much better clarity on the sources of types and methods. As in, what comes from which package.
   2. Makie 0.11.2 has Left and Right causing naming conflicts
   3. We can easily afford import since we don't have super heavy dependency on other packages
2. Add AbstractDirection and make it the supertype of Up, Down, Left, Right. Deprecate Direction
3. Add and use move and turn methods instead of functors for clarity.
4. Remove exports that are not necessary for using the environments.
5. merge PR #113 changes again since I forgot to rebase my branch for this PR 😅

[codecov-io]

Codecov Report

Merging #114 (086cf08) into master (756203a) will decrease coverage by 1.49%. The diff coverage is 56.97%.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
- Coverage   79.40%   77.91%   -1.50%     
==========================================
  Files          17       17              
  Lines         845      797      -48     
==========================================
- Hits          671      621      -50     
- Misses        174      176       +2     

Impacted Files	Coverage Δ
src/GridWorlds.jl	100.00% <ø> (ø)
src/grid_world_base.jl	94.73% <ø> (-0.39%)	:arrow_down:
src/makie_rendering.jl	0.00% <0.00%> (ø)
src/abstract_grid_world.jl	75.00% <90.00%> (-1.48%)	:arrow_down:
src/actions.jl	100.00% <100.00%> (ø)
src/directions.jl	100.00% <100.00%> (ø)
src/envs/collectgems.jl	100.00% <100.00%> (ø)
src/envs/doorkey.jl	100.00% <100.00%> (ø)
src/envs/dynamicobstacles.jl	97.40% <100.00%> (-0.13%)	:arrow_down:
src/envs/emptyroom.jl	100.00% <100.00%> (ø)
... and 18 more

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