Support SET command

[waitingkuo]

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a SET command to change the value in config_options

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following what postgresql has except [LOCAL]
https://www.postgresql.org/docs/current/sql-set.html

assignment operator should support both TO and =
value should support single quoted string / number / bool / non space separate string

SET [VARIABLE] [TO | =] [VALUE | 'VALUE']

e.g.

❯ set datafusion.execution.batch_size = 1;

❯ set datafusion.execution.coalesce_batches to 'false';

support alias TIME ZONE and TIMEZONE (same as postgrseql https://www.postgresql.org/docs/current/sql-set.html)

❯ set time zone = 1;

note that this should return error for now as discussed in #3148 (comment)
cc @avantgardnerio @alamb

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[alamb]

YES! This will be awesome

Note there is still some nonsense related to Config settings (e.g. see #3885 (review)) but I think supporting the SET command will provide us that much more reason to unify the configuration story