Use case insensitive map when binding query

[andyfengHKU]

Description

Make all variable name case insensitive in cypher statement. This behavior is more consistent with other database systems.

Fixes #3916

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.97%. Comparing base (89d0fc7) to head (c4049aa).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5200   +/-   ##
=======================================
  Coverage   86.97%   86.97%           
=======================================
  Files        1405     1405           
  Lines       61622    61622           
  Branches     7543     7543           
=======================================
+ Hits        53594    53596    +2     
+ Misses       7854     7852    -2     
  Partials      174      174           

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[github-actions]

Benchmark Result

Master commit hash: 89d0fc764bcef2e70dc6fd6324b16ae7ab241f18
Branch commit hash: dc4c9d9e47f8759cc86adabed1a26af2d1d2382e

Query Group	Query Name	Mean Time - Commit (ms)	Mean Time - Master (ms)	Diff
aggregation	q24	725.53	N/A	N/A
aggregation	q28	6500.19	N/A	N/A
filter	q14	125.86	N/A	N/A
filter	q15	122.60	N/A	N/A
filter	q16	342.42	N/A	N/A
filter	q17	444.76	N/A	N/A
filter	q18	1921.28	N/A	N/A
filter	zonemap-node	89.33	N/A	N/A
filter	zonemap-node-lhs-cast	89.15	N/A	N/A
filter	zonemap-node-null	89.24	N/A	N/A
filter	zonemap-rel	5391.98	N/A	N/A
fixed_size_expr_evaluator	q07	678.29	N/A	N/A
fixed_size_expr_evaluator	q08	961.43	N/A	N/A
fixed_size_expr_evaluator	q09	960.48	N/A	N/A
fixed_size_expr_evaluator	q10	254.09	N/A	N/A
fixed_size_expr_evaluator	q11	254.05	N/A	N/A
fixed_size_expr_evaluator	q12	232.73	N/A	N/A
fixed_size_expr_evaluator	q13	1565.28	N/A	N/A
fixed_size_seq_scan	q23	117.07	N/A	N/A
join	q29	758.92	N/A	N/A
join	q30	1613.80	N/A	N/A
join	q31	8.41	N/A	N/A
join	SelectiveTwoHopJoin	45.98	N/A	N/A
ldbc_snb_ic	q35	10.69	N/A	N/A
ldbc_snb_ic	q36	101.63	N/A	N/A
ldbc_snb_is	q32	6.57	N/A	N/A
ldbc_snb_is	q33	14.23	N/A	N/A
ldbc_snb_is	q34	1.31	N/A	N/A
multi-rel	multi-rel-large-scan	1744.84	N/A	N/A
multi-rel	multi-rel-lookup	8.83	N/A	N/A
multi-rel	multi-rel-small-scan	208.32	N/A	N/A
order_by	q25	126.92	N/A	N/A
order_by	q26	447.31	N/A	N/A
order_by	q27	1401.08	N/A	N/A
recursive_join	recursive-join-bidirection	281.95	N/A	N/A
recursive_join	recursive-join-dense	7117.57	N/A	N/A
recursive_join	recursive-join-path	23362.24	N/A	N/A
recursive_join	recursive-join-sparse	632.61	N/A	N/A
recursive_join	recursive-join-trail	7054.71	N/A	N/A
scan_after_filter	q01	170.41	N/A	N/A
scan_after_filter	q02	155.77	N/A	N/A
shortest_path_ldbc100	q37	96.93	N/A	N/A
shortest_path_ldbc100	q38	297.58	N/A	N/A
shortest_path_ldbc100	q39	58.15	N/A	N/A
shortest_path_ldbc100	q40	362.78	N/A	N/A
var_size_expr_evaluator	q03	2109.72	N/A	N/A
var_size_expr_evaluator	q04	2200.61	N/A	N/A
var_size_expr_evaluator	q05	2682.80	N/A	N/A
var_size_expr_evaluator	q06	1352.98	N/A	N/A
var_size_seq_scan	q19	1434.47	N/A	N/A
var_size_seq_scan	q20	2374.95	N/A	N/A
var_size_seq_scan	q21	2254.85	N/A	N/A
var_size_seq_scan	q22	126.38	N/A	N/A

[ray6080]

Can you also test the case when we load from a external db source?