Fix PhpDoc comments for message accessors to include "|null". #8136
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Message accessors will return null when when the field is not
set, so this should be reflected in the PhpDoc.
Also updated the code generator for the well-known types to reflect
the edits made in #8105.
Also explicitly check for upb_msg_has() in the oneof accessor, so
we are not implicitly relying on unset message fields returning NULL
at the upb level.