[infra] Improve quote_table_name to accept full-qualified table identifiers

[amotl]

@seut: Do you think this routine needs to be improved? You mentioned something about "quoting going south". Maybe the root cause is here, because the routine may only handle a few situations correctly?

Yes the issue here is that it will not quote anything if the ident contains a . like foo.bar. This looks a bit wrong as it normally should quote an ident which contains dots, this would be a valid table name for PG but not for CrateDB which forbids using a . inside a table identifier (see https://cratedb.com/docs/crate/reference/en/latest/general/ddl/create-table.html#naming-restrictions).
But then I wonder why you're not using sqlalchemy.sql.expression.quoted_name which works similar afaik.
That it tries to detect a FQ identifier, splits it and quotes all parts separately, would be a bit custom but needed if the schema and table idents are not quoted dedicated.

Originally posted by @seut in #88 (comment)

[amotl]

@seut submitted a patch including a corresponding improvement. Thank you.

• Use sqlalchemy's 'quote' function to quote table names and fix table quoting in cfr exporter #172