Implement get_keys function in fts

[acquamarin]

Description

Please include a summary of the changes and the related issue (if applicable). Please also include
relevant motivation and context.

Fixes # (issue)

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[github-actions]

Benchmark Result

Master commit hash: 109012e08f4fb43a8a1605c0065fb32d085381db
Branch commit hash: c2817b2eba7bef6badb4165065fb6e9d98603709

Query Group	Query Name	Mean Time - Commit (ms)	Mean Time - Master (ms)	Diff
aggregation	q24	644.67	644.42	0.24 (0.04%)
aggregation	q28	11343.72	11074.35	269.37 (2.43%)
filter	q14	126.50	125.33	1.18 (0.94%)
filter	q15	128.99	126.98	2.01 (1.59%)
filter	q16	302.58	302.58	0.00 (0.00%)
filter	q17	443.59	445.66	-2.07 (-0.46%)
filter	q18	1967.47	1998.87	-31.39 (-1.57%)
filter	zonemap-node	86.29	89.75	-3.46 (-3.86%)
filter	zonemap-node-lhs-cast	86.42	88.09	-1.67 (-1.90%)
filter	zonemap-rel	5696.00	5725.58	-29.59 (-0.52%)
fixed_size_expr_evaluator	q07	573.04	570.59	2.45 (0.43%)
fixed_size_expr_evaluator	q08	802.77	801.41	1.36 (0.17%)
fixed_size_expr_evaluator	q09	798.97	800.11	-1.14 (-0.14%)
fixed_size_expr_evaluator	q10	237.07	235.47	1.60 (0.68%)
fixed_size_expr_evaluator	q11	229.91	227.36	2.55 (1.12%)
fixed_size_expr_evaluator	q12	224.48	225.69	-1.21 (-0.54%)
fixed_size_expr_evaluator	q13	1457.81	1454.10	3.71 (0.26%)
fixed_size_seq_scan	q23	111.73	109.85	1.88 (1.71%)
join	q29	580.52	591.34	-10.82 (-1.83%)
join	q30	1638.15	1452.69	185.47 (12.77%)
join	q31	3.56	4.46	-0.91 (-20.33%)
join	SelectiveTwoHopJoin	51.14	53.96	-2.82 (-5.22%)
ldbc_snb_ic	q35	2623.71	2557.10	66.61 (2.61%)
ldbc_snb_ic	q36	531.44	582.96	-51.52 (-8.84%)
ldbc_snb_is	q32	6.38	5.35	1.03 (19.24%)
ldbc_snb_is	q33	12.76	11.27	1.49 (13.23%)
ldbc_snb_is	q34	1.20	1.09	0.12 (10.60%)
multi-rel	multi-rel-large-scan	1226.58	1395.96	-169.38 (-12.13%)
multi-rel	multi-rel-lookup	20.29	16.80	3.49 (20.78%)
multi-rel	multi-rel-small-scan	91.63	107.47	-15.84 (-14.74%)
order_by	q25	131.81	127.60	4.21 (3.30%)
order_by	q26	446.20	448.19	-1.99 (-0.44%)
order_by	q27	1463.52	1481.08	-17.56 (-1.19%)
recursive_join	recursive-join-bidirection	317.94	284.88	33.06 (11.60%)
recursive_join	recursive-join-dense	7449.05	7432.96	16.09 (0.22%)
recursive_join	recursive-join-path	23749.13	23874.06	-124.92 (-0.52%)
recursive_join	recursive-join-sparse	14468.51	14362.64	105.87 (0.74%)
recursive_join	recursive-join-trail	7401.48	7368.60	32.88 (0.45%)
scan_after_filter	q01	169.45	170.81	-1.37 (-0.80%)
scan_after_filter	q02	155.94	155.16	0.78 (0.50%)
shortest_path_ldbc100	q37	86.43	94.48	-8.05 (-8.52%)
shortest_path_ldbc100	q38	367.67	354.90	12.77 (3.60%)
shortest_path_ldbc100	q39	62.36	54.07	8.29 (15.33%)
shortest_path_ldbc100	q40	415.68	458.51	-42.83 (-9.34%)
var_size_expr_evaluator	q03	2064.83	2122.09	-57.26 (-2.70%)
var_size_expr_evaluator	q04	2236.47	2278.53	-42.06 (-1.85%)
var_size_expr_evaluator	q05	2701.62	2557.40	144.22 (5.64%)
var_size_expr_evaluator	q06	1340.86	1348.40	-7.54 (-0.56%)
var_size_seq_scan	q19	1467.70	1482.42	-14.72 (-0.99%)
var_size_seq_scan	q20	2708.25	2690.52	17.73 (0.66%)
var_size_seq_scan	q21	2301.98	2301.68	0.30 (0.01%)
var_size_seq_scan	q22	125.89	128.06	-2.17 (-1.69%)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.52%. Comparing base (109012e) to head (7ea4176).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/planner/plan/plan_read.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4647   +/-   ##
=======================================
  Coverage   86.51%   86.52%           
=======================================
  Files        1369     1369           
  Lines       57983    57983           
  Branches     7209     7208    -1     
=======================================
+ Hits        50166    50167    +1     
+ Misses       7649     7648    -1     
  Partials      168      168           

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