Move Space from RLEnvs to RLBase

[findmyway]

Move Space here since some algorithms may rely on the type of state space or action space to dispatch different implementations.

[codecov-io]

Codecov Report

Merging #119 (89b4f71) into master (e4f9ff9) will decrease coverage by 1.19%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
- Coverage   11.73%   10.54%   -1.20%     
==========================================
  Files           5        5              
  Lines         230      256      +26     
==========================================
  Hits           27       27              
- Misses        203      229      +26     

Impacted Files	Coverage Δ
src/base.jl	0.00% <0.00%> (ø)

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