Make `switch_direction` consistent

[mateuszbaran]

This PR implements a solution that will resolve #637 by introducing four different action directions instead of just two.

TODO:

• [x] review rotation action directions.
• [x] implement forward-right and backward-left actions.

[codecov[bot]]

Codecov Report

Merging #639 (c7f8c9c) into master (4b80c6e) will decrease coverage by 58.39%. The diff coverage is 90.44%.

@@             Coverage Diff             @@
##           master     #639       +/-   ##
===========================================
- Coverage   98.87%   40.49%   -58.39%     
===========================================
  Files         106      106               
  Lines       10206    10081      -125     
===========================================
- Hits        10091     4082     -6009     
- Misses        115     5999     +5884     

Impacted Files	Coverage Δ
src/Manifolds.jl	66.66% <ø> (-20.00%)	:arrow_down:
src/groups/circle_group.jl	83.58% <ø> (-16.42%)	:arrow_down:
src/groups/group_operation_action.jl	84.44% <ø> (-15.56%)	:arrow_down:
src/groups/multiplication_operation.jl	83.58% <ø> (-16.42%)	:arrow_down:
src/groups/rotation_action.jl	77.17% <56.25%> (-22.83%)	:arrow_down:
src/groups/translation_action.jl	84.37% <75.00%> (-15.63%)	:arrow_down:
src/groups/group_action.jl	85.10% <81.81%> (-5.60%)	:arrow_down:
src/groups/metric.jl	65.00% <87.50%> (-35.00%)	:arrow_down:
src/groups/general_unitary_groups.jl	94.69% <92.85%> (-5.31%)	:arrow_down:
ext/ManifoldsTestExt/tests_group.jl	92.87% <100.00%> (-2.14%)	:arrow_down:
... and 8 more

... and 80 files with indirect coverage changes

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[mateuszbaran]

I think this should be more or less ready. @olivierverdier , do you think this solves the issue? I was trying to make the default close to what we currently have but now you can express all four options and switch just the left/right or forward/backward part of the action. Rotation and translation actions are all forward now.

[olivierverdier]

It does solve the issue, thank you!