Refactor code into new JsonbValueAsText, and use it more

jsonb_object_field_text and jsonb_array_element_text both contained
identical copies of this code, so extract that into new routine
JsonbValueAsText.  This can also be used in other places, to measurable
performance benefit: the jsonb_each() and jsonb_array_elements()
functions can use it for outputting text forms instead of their less
efficient current implementation (because we no longer need to build
intermediate a jsonb representation of each value).

Author: Nikita Glukhov
Discussion: 
https://postgr.es/m/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/abb014a63106653f2872a3b1662a79ab80d4dcbb

Modified Files
--------------
src/backend/utils/adt/jsonfuncs.c | 173 ++++++++++++++------------------------
1 file changed, 61 insertions(+), 112 deletions(-)

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