Selection course api implemented

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Best reviewed: commit by commit

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Optimal code review plan (4 warnings)

     feat(selection): query available sectors      style: cleanup

feat(selection): query available classes

> `pysjtu/schemas/base.py` 76% changes removed in fix(selection): insu...

fix(selection): insufficient constraints

> `pysjtu/parser/selection.py` 50% changes removed in fix(selection): miss...

     feat(selection): (de)register classes

refactor: adjust schemas and models

> `pysjtu/models/__init__.py` 50% changes removed in style: code cleanup

     fix(utils): base64 before elfhash      test: add test for selection      fix(selection): silently fail when selection page is not available      fix(selection): query batch is not large enough      feat(selection): add cache for classes query      fix(selection): missing query params

test(selection): add mock api test

> `pysjtu/client/api/selection.py` 93% changes removed in style: code cleanup

     doc: update README.md      style: code cleanup

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