Reduce max column name size (during CSV import) further

[mathemancer]

Fixes #2714

This reduces the max length for an identifier to 48 bytes.

Technical details

We should be able to support up to 63 bytes (as we had set previously), since this is what PostgreSQL supports. However, that's not working, and it's not worth figuring out which part of a machine we're going to rework over the next month is mangling the identifiers.

Screenshots

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[mathemancer]

Converting to draft; We've decided to try harder to figure out what the actual underlying issue is.

[dmos62]

Taking this over after checking with @silentninja.

[silentninja]

Looks good @dmos62, other than the previously requested changes to the identifier_size_limit I don't have any other concerns. Please merge the PR after making the requested change