Convert the backend meta generation for episodics to scale much nicer

[CerealBoy]

Checklist

• Tagged appropriate reviewers.
• Ran all appropriate tests.
• Included details and screenshots in PR description.
• Added references for any issues being actioned.

Description

Moving the episodic.meta generation into SQL, rather than loading all episodes for 1..x Episodic entries. This way, at least somewhat efficient querying is performed to generate the metadata rather than computing in Go, which itself was fast, more that there was a lot of data being put into memory for very little numbers.

Tests

Soon ™️.

[github-actions]

Merging this branch will not change overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/cloudcloud/episodical/pkg/data	0.00% (ø)
github.com/cloudcloud/episodical/pkg/server	0.00% (ø)
github.com/cloudcloud/episodical/pkg/types	0.00% (ø)

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/cloudcloud/episodical/pkg/data/episodic.go	0.00% (ø)	431 (+21)	0	431 (+21)
github.com/cloudcloud/episodical/pkg/data/loaders.go	0.00% (ø)	75 (-10)	0	75 (-10)
github.com/cloudcloud/episodical/pkg/server/handlers.go	0.00% (ø)	143 (-27)	0	143 (-27)
github.com/cloudcloud/episodical/pkg/server/server.go	0.00% (ø)	37 (+1)	0	37 (+1)
github.com/cloudcloud/episodical/pkg/types/collections.go	0.00% (ø)	173	0	173

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.