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

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=1OwOw@mail.gmail.com