feat: pack components

[mr-cal]

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Pack components with snap pack.

Snaps can have custom filenames using --output (i.e. snapcraft pack --output my-dir/my-snap.snap)

However, components cannot. Their names are determined by snap pack. They will still be placed in the same output directory (my-dir in the example above).

Fixes #4467
(CRAFT-2313)

[codecov-commenter]

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##             feature/components    #4506   +/-   ##
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[cmatsuoka]

Looks nice, can you add a spread test for component creation?

[mr-cal]

pyright failure is unrelated. I don't think pyright is pinned in this branch.

[mr-cal]

Pyright failure addressed in #4512

[lengau]

Fantastic!