Feature/dimensions cleanup

[wolflu05]

This PR refactors the generators into own classes and adds the ability to have multiple generators in one dimension.

⚠️ Breaking

Infinity generators now need a * before their name and the ALPHA_* generators were renamed to ALPHA with a casing=lower parameter.

Migration:

NUMERIC -> *NUMERIC ALPHA_LOWER -> *ALPHA{casing=lower} ALPHA_UPPER -> *ALPHA{casing=upper}

Todo

• [x] Add word generators
• [x] Parse new dimension syntax
• [x] Add each generator into own subclass
• [x] Refactor, Generators are currently wrongly called dimensions
• [x] Add tests
• [x] Add docs

Fixes

fixes #4

[github-actions[bot]]

Coverage Report

	Name	Stmts	Miss	Cover	Missing
inventree_bulk/BulkActionPlugin.py	118	0	100%
inventree_bulk/BulkGenerator/BulkGenerator.py	85	0	100%
inventree_bulk/BulkGenerator/dimensions.py	66	0	100%
inventree_bulk/BulkGenerator/generators/gen_alpha.py	36	0	100%
inventree_bulk/BulkGenerator/generators/gen_numeric.py	14	0	100%
inventree_bulk/BulkGenerator/generators/generator.py	33	0	100%
inventree_bulk/BulkGenerator/validations.py	24	0	100%
inventree_bulk/migrations/0001_initial.py	6	0	100%
inventree_bulk/models.py	21	0	100%
inventree_bulk/version.py	1	0	100%
TOTAL	404	0	100%