Add support to show ANTLR Batch parsing time along with other explain information

[Deepesh125]

This commit adds support to show ANTLR parsing time with EXPLAIN info. With this change, query plan would look like following:

1> select 1 + 1
2> select 'abc' + 'def'
3> go

-----------
          2

(1 rows affected)
QUERY PLAN
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Query Text: select 1 + 1
Result  (cost=0.00..0.01 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=1)
Planning Time: 0.389 ms
Execution Time: 0.057 ms

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
abcdef

(1 rows affected)
QUERY PLAN
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Query Text: select 'abc' + 'def'
Result  (cost=0.00..0.01 rows=1 width=32) (actual time=0.025..0.026 rows=1 loops=1)
Planning Time: 0.219 ms
Execution Time: 0.083 ms

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Babelfish T-SQL Batch Parsing Time: 103.177 ms

Cherry-pick of #2647

Task: BABEL-3650
Signed-off-by: Dipesh Dhameliya dddhamel@amazon.com

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[coveralls]

Pull Request Test Coverage Report for Build 9608171114

Details

• 41 of 43 (95.35%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 73.362%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
contrib/babelfishpg_tsql/src/iterative_exec.c	39	41	95.12%

Totals
Change from base Build 9568439596:	0.02%
Covered Lines:	42117
Relevant Lines:	57410

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💛 - Coveralls