Add records.delete RPC function

[mathemancer]

Fixes #3737

Adds a records.delete function.

Technical details

As with the old REST endpoint, this function takes an array of records to delete (for a single table).

The function is documented, and should be self-explanatory.

Screenshots

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[mathemancer]

@Anish9901 This shouldn't be merged until after #3740 , but can be reviewed now.

[Anish9901]

Would there be any performance benefits by converting this function to SQL? I guess we couldn't make it STABLE since it does modify the database.

[mathemancer]

we actually can't change this to an SQL function, since there wouldn't be a way to get the schema, table, or pkey column names. The overall flow of "build a string of the SQL to execute, then run it" doesn't work in SQL functions.