Display accurate infoAlertText on foreign key columns with locked data types

[ejenk0]

Fixes #3247

Technical details

• Replace the infoAlertText string in ColumnType.svelte with an async function that checks if the referent column is a primary key and displays appropriate text.
• As a result, if the data type of the column is not locked due to being a primary key (i.e. if this column is a foreign key), the InfoBox will not render until the query to the columns api is complete.

Screenshots
Example of InfoBox for a column referencing a unique column.

Example of InfoBox for a column referencing a primary key.

Example of InfoBox being unrendered due to the API call not yet being fulfilled.

/cc @seancolsen @mathemancer @kgodey to review text

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[ejenk0]

This is my first time touching Svelte and my first time contributing to an open-source project, so feedback on my code or my git/github stuff is appreciated!

[seancolsen]

Thanks for making this PR @ejenk0!

We had some discussion in the ticket in order to take this change in a different direction, thus I'm closing this PR. You're welcome to submit another PR which makes the change now described in the ticket.