Add HINT listing valid encodings to encode() and decode() errors.

This commit updates encode() and decode() so that when an invalid encoding
is specified, their error message includes a HINT listing all valid encodings.
This helps users quickly see which encodings are supported without needing
to consult the documentation.

Author: Shinya Sugamoto <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Reviewed-by: Daniel Gustafsson <[email protected]>
Reviewed-by: Masahiko Sawada <[email protected]>
Reviewed-by: Peter Eisentraut <[email protected]>
Reviewed-by: Nathan Bossart <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: 
https://postgr.es/m/CAAe3y+99sfPv8UDF1VM-rC1i5HBdqxUh=2HrbJJFm2+i=1o...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/99780da7209605bf9f226eac3eac30ab2bc9427c

Modified Files
--------------
src/backend/utils/adt/encode.c        | 8 ++++++--
src/test/regress/expected/strings.out | 7 +++++++
src/test/regress/sql/strings.sql      | 4 ++++
3 files changed, 17 insertions(+), 2 deletions(-)

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