pgsql: Support domains over composite types in PL/Tcl.

Support domains over composite types in PL/Tcl.

Since PL/Tcl does little with SQL types internally, this is just a
matter of making it work with composite-domain function arguments
and results.

In passing, make it allow RECORD-type arguments --- that's a trivial
change that nobody had bothered with up to now.

Discussion: /messages/by-id/4206.1499798337@sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/820c0305f64507490f00b6220f9175a303c821dd

Modified Files
--------------
src/pl/tcl/expected/pltcl_queries.out | 94 +++++++++++++++++++++++++++++++++++
src/pl/tcl/pltcl.c | 82 ++++++++++++++++++++----------
src/pl/tcl/sql/pltcl_queries.sql | 43 ++++++++++++++++
3 files changed, 193 insertions(+), 26 deletions(-)

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