pg_stat_statements: Add more tests for level tracking

This commit adds tests to verify the computation of the nesting level
for two code paths: the planner hook and the ExecutorFinish() hook.  The
nesting level is essential to save a correct "toplevel" status for the
added PGSS entries.

The author has noticed that removing the manipulations of nesting_level
in these two code paths did not cause the tests to complain, meaning
that we never had coverage for the assumptions taken by the code.

Author: Sami Imseih <[email protected]>
Discussion: 
https://postgr.es/m/caa5rz0uk1psrgf52bwctdpzaqbwt04o6za7zbm6uqyv7vyv...@mail.gmail.com

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/1572ea96e65731eee3227fbc3c119bd9f39e8e50

Modified Files
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.../pg_stat_statements/expected/level_tracking.out | 66 ++++++++++++++++++++++
contrib/pg_stat_statements/sql/level_tracking.sql  | 38 +++++++++++++
2 files changed, 104 insertions(+)

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