Move morsel dispatcher out of frontier pair

[andyfengHKU]

Description

This PR moves morsel dispatcher out of frontier pair and into FrontierTask so that the design is consistent for Vertex/Edge Compute.

Fixes # (issue)

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[github-actions]

Benchmark Result

Master commit hash: 5e63cf2574ffe76c1a7fb2ca625e921acd932eaf
Branch commit hash: 37cf35ba35f05f580291b850108676a7c11efe5c

Query Group	Query Name	Mean Time - Commit (ms)	Mean Time - Master (ms)	Diff
aggregation	q24	665.73	668.16	-2.44 (-0.36%)
aggregation	q28	11111.31	13616.93	-2505.62 (-18.40%)
filter	q14	137.70	141.40	-3.70 (-2.62%)
filter	q15	140.47	143.93	-3.46 (-2.40%)
filter	q16	318.50	322.81	-4.31 (-1.34%)
filter	q17	465.56	466.09	-0.53 (-0.11%)
filter	q18	1963.31	1971.82	-8.51 (-0.43%)
filter	zonemap-node	99.33	100.80	-1.46 (-1.45%)
filter	zonemap-node-lhs-cast	99.31	99.13	0.18 (0.18%)
filter	zonemap-node-null	94.87	96.21	-1.34 (-1.39%)
filter	zonemap-rel	5757.64	5796.83	-39.18 (-0.68%)
fixed_size_expr_evaluator	q07	599.58	591.40	8.18 (1.38%)
fixed_size_expr_evaluator	q08	833.10	827.38	5.73 (0.69%)
fixed_size_expr_evaluator	q09	816.94	827.49	-10.55 (-1.27%)
fixed_size_expr_evaluator	q10	252.89	251.28	1.60 (0.64%)
fixed_size_expr_evaluator	q11	246.26	243.74	2.52 (1.03%)
fixed_size_expr_evaluator	q12	246.79	239.68	7.11 (2.97%)
fixed_size_expr_evaluator	q13	1493.60	1477.34	16.26 (1.10%)
fixed_size_seq_scan	q23	133.05	126.68	6.37 (5.03%)
join	q29	602.56	637.04	-34.49 (-5.41%)
join	q30	10363.60	10193.64	169.96 (1.67%)
join	q31	6.07	5.28	0.79 (14.91%)
join	SelectiveTwoHopJoin	55.32	51.95	3.37 (6.50%)
ldbc_snb_ic	q35	2572.07	2583.52	-11.45 (-0.44%)
ldbc_snb_ic	q36	484.89	491.09	-6.20 (-1.26%)
ldbc_snb_is	q32	7.09	7.07	0.02 (0.33%)
ldbc_snb_is	q33	11.73	15.05	-3.32 (-22.06%)
ldbc_snb_is	q34	1.27	1.24	0.03 (2.15%)
multi-rel	multi-rel-large-scan	1359.33	1350.58	8.75 (0.65%)
multi-rel	multi-rel-lookup	9.49	30.23	-20.74 (-68.62%)
multi-rel	multi-rel-small-scan	87.63	94.37	-6.74 (-7.14%)
order_by	q25	138.33	146.37	-8.04 (-5.50%)
order_by	q26	469.75	469.53	0.22 (0.05%)
order_by	q27	1484.81	1490.73	-5.92 (-0.40%)
recursive_join	recursive-join-bidirection	303.80	301.90	1.90 (0.63%)
recursive_join	recursive-join-dense	7481.60	7460.79	20.82 (0.28%)
recursive_join	recursive-join-path	23987.56	24104.58	-117.01 (-0.49%)
recursive_join	recursive-join-sparse	1074.66	1062.94	11.71 (1.10%)
recursive_join	recursive-join-trail	7408.06	7392.65	15.41 (0.21%)
scan_after_filter	q01	181.17	182.92	-1.75 (-0.96%)
scan_after_filter	q02	170.72	168.99	1.73 (1.02%)
shortest_path_ldbc100	q37	89.51	94.09	-4.58 (-4.87%)
shortest_path_ldbc100	q38	296.18	372.08	-75.90 (-20.40%)
shortest_path_ldbc100	q39	60.87	60.94	-0.07 (-0.12%)
shortest_path_ldbc100	q40	382.34	397.34	-15.00 (-3.77%)
var_size_expr_evaluator	q03	2122.54	2100.46	22.08 (1.05%)
var_size_expr_evaluator	q04	2262.79	2297.11	-34.32 (-1.49%)
var_size_expr_evaluator	q05	2690.51	2792.49	-101.98 (-3.65%)
var_size_expr_evaluator	q06	1348.53	1353.17	-4.64 (-0.34%)
var_size_seq_scan	q19	1457.15	1464.29	-7.15 (-0.49%)
var_size_seq_scan	q20	2659.23	2727.51	-68.27 (-2.50%)
var_size_seq_scan	q21	2297.26	2311.86	-14.60 (-0.63%)
var_size_seq_scan	q22	128.26	131.62	-3.36 (-2.56%)