Fix MySQL options column imports that have commas or other type names in them.

[samwho]

Description

We had a user reporting that their enum columns weren't being imported correctly. On investigation, I found 2 separate bugs with enum imports in MySQL:

• We weren't correctly parsing commas in enum fields, so enum variants containing commas could break it.
• We were incorrectly checking enum variants to see if they were type names, confusing the heuristics that determine what Budibase type to assign to a field.

This PR fixes both and adds tests to prevent regression.

Launchcontrol

• Fixes some bugs around importing tables that have enum column where the enum variants contain commas or type names.

[qa-wolf]

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[mike12345567]

LGTM! Thanks for quick fix