pgAdmin 4 commit: Add a framework for testing reversed engineered SQL a

Add a framework for testing reversed engineered SQL and CRUD API endpoints. Fixes #4202

Branch
------
electron2

Details
-------
https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=413f495cc8395c3f999ce746713c2983439d6a9e
Author: Akshay Joshi <akshay.joshi@enterprisedb.com>

Modified Files
--------------
Makefile                                           |   3 +
docs/en_US/release_notes_4_9.rst                   |   1 +
.../casts/tests/default/alter_implicit_cast.sql    |   9 +
.../casts/tests/default/create_implicit_cast.sql   |   7 +
.../databases/casts/tests/default/test.json        |  68 +++++++
.../databases/schemas/collations/tests/__init__.py |   3 +-
.../databases/schemas/synonyms/tests/__init__.py   |   3 +-
.../databases/schemas/views/tests/__init__.py      |   3 +-
web/pgadmin/utils/route.py                         |  42 +++-
web/regression/README                              |   3 +
web/regression/re_sql/__init__.py                  |   0
web/regression/re_sql/tests/__init__.py            |   0
web/regression/re_sql/tests/test_resql.py          | 225 +++++++++++++++++++++
web/regression/runtests.py                         |   7 +
14 files changed, 359 insertions(+), 15 deletions(-)