Add a non-strict version of jsonb_set

jsonb_set_lax() is the same as jsonb_set, except that it takes and extra
argument that specifies what to do if the value argument is NULL. The
default is 'use_json_null'. Other possibilities are 'raise_exception',
'return_target' and 'delete_key', all these behaviours having been
suggested as reasonable by various users.

Discussion: 
https://postgr.es/m/375873e2-c957-3a8d-64f9-26c43c2b1...@2ndquadrant.com

Reviewed by: Pavel Stehule

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/a83586b5543b948f9e621462537a7303b113c482

Modified Files
--------------
doc/src/sgml/func.sgml               | 23 +++++++++++++
src/backend/catalog/system_views.sql |  9 +++++
src/backend/utils/adt/jsonfuncs.c    | 64 ++++++++++++++++++++++++++++++++++++
src/include/catalog/pg_proc.dat      |  3 ++
src/test/regress/expected/jsonb.out  | 57 ++++++++++++++++++++++++++++++++
src/test/regress/sql/jsonb.sql       | 20 +++++++++++
6 files changed, 176 insertions(+)

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