f97f3dcc

By: Michael Lynch <git@mtlynch.io>

Add typed media content type

Introduce mediastore.ContentType for media writer content types while keeping storage keys as strings. This ports only the content type wrapper from origin/slice-1 without pulling in the broader storage key changes.
configuredevShellbackendbackend-devcheck-bashcheck-frontendcheck-go-formattingcheck-go-test-packagescheck-trailing-newlinecheck-trailing-whitespacediagrame2e-testsgo-testsimport-from-tinybeanslint-sqllittle-momentslittle-moments-devx86_64-linux