Add missing point groups

[argerlt]

Breaking out this part of #563 into it's own PR.

Description of the change

This adds all the missing default point group symmetries to the symmetry module, and creates a dictionary of important sets of point groups. This also means replacing symmetry._groups and symmetry._proper_groups with (depending on the application) symmetry._symm_lists['permutations'], symmetry._symm_lists['groups'], or symmetry._symm_lists['proper_groups'] where appropriate. These are all private changes, and shouldn't affect any public-facing performance.

At one point last year a variation of this done in #563, and the suggestion was made that instead of dictionaries of lists of groups, we should just have a PointGroups class. I still agree with that idea, this seperate sub-issue is just about adding the private variables with the correct lists and names, so that #563 doesn't need to be a 1800+ line PR.

Progress of the PR

• Docstrings for all functions
• Unit tests with pytest for all lines
• Clean code style by running black via pre-commit

Minimal example of the bug fix or new feature

import orix.quaternion.symmetry as osm

# all 32 standard point groups, equivalent to the old `_groups` list
osm._point_groups_dictionary['groups']

# all  11 standard proper point groups, equivalent to the old `_proper_groups` list
osm._point_groups_dictionary['proper_groups']

# all  11 laue groups, equivalent to 'proper_groups' but with the inversions added
osm._point_groups_dictionary['laue']

# all 37 non-standard point groups necessary to build the 32 standard ones.
# ie, this includes things like C2y and Csx 
osm._point_groups_dictionary['proper_groups']

# all the other entries also discussed over the course of #563, including the lists above
# but with the redundant symmetries added, like S2 == Ci
osm._point_groups_dictionary.keys()

For reviewers

• The PR title is short, concise, and will make sense 1 year later.
• New functions are imported in corresponding __init__.py.
• New features, API changes, and deprecations are mentioned in the unreleased
  section in CHANGELOG.rst.
• Contributor(s) are listed correctly in __credits__ in orix/__init__.py and in
  .zenodo.json.

[argerlt]

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