audit all types for literal_execute() handling

audit all types for literal_execute() handling

Added auditing to the test suite which exercises the literal execute
processors across all datatypes and dialects to ensure that string input is
either appropriately rejected or correctly escaped.  Literal execute
processors are invoked when the :paramref:`.bindparam.literal_execute`
parameter is used with an explicit :func:`.bindparam` object, which
overrides DBAPI-native bind handling to render the value inline with the
statement instead. Datatypes that were updated include the originally
reported SQL Server ``Uuid`` / ``UNIQUEIDENTIFIER`` rendering which now
escapes properly, the :class:`.JSONPATH` type that's currently
PostgreSQL-only, and a full family of numeric types stemming from the
:class:`_types.Float` and :class:`_types.Numeric` bases which now coerce
the value to a number, rejecting non-numeric input.  Thanks to Javid Khan
for helping to identify the issue.

Fixes: #13448
Change-Id: Ic1a0643fa08e6ba92a54b6032355ef66f61fdb89