Deprecate autovivification on false

Deprecate automatically converting "false" into an empty array
on write operands. Autovivification continues to be supported
for "null" values, as

Deprecate autovivification on false

Deprecate automatically converting "false" into an empty array
on write operands. Autovivification continues to be supported
for "null" values, as well as undefined/uninitialized values.

RFC: https://wiki.php.net/rfc/autovivification_false

Closes GH-7131.

Co-authored-by: Tyson Andre <tysonandre775@hotmail.com>
Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

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