reimnplement chagnes deconstruct_array -> deconstruct_array_builtin as have been done in d746021d

Remove options check for bloom options, that was not there before. It has logic behid it, but should be processed as separate commit

As more experienced pg-developers told me, you can call relation_open with AccessShareLock, on a table you are going to work with, any time you like, without being ashamed about it. It will not slow down anything.

But this lock is visible when you have prepared transaction, so have to update
twophase test of test_decoding extension.

Change behaviour of RESETting illegal value, so illegal value that was already set for some reason, was actually removed

Do not use option spec flags, use options postprocess callback for setting specific values in toast options binary representation