dolt table import --all-text correctly infers pk if none given

[stephkyou]

dolt table import will use the first column in the import file as the primary key if none is explicitly defined. This change updates --all-text to also correctly do this inference.

[fulghum]

Looks good! 🚢

[github-actions]

@coffeegoddd DOLT

test_name	detail	row_cnt	sorted	mysql_time	sql_mult	cli_mult
batching	LOAD DATA	10000	1	0.06	0.5
batching	batch sql	10000	1	0.1	1.1
batching	by line sql	10000	1	0.11	1
blob	1 blob	200000	1	0.92	3.2	3.49
blob	2 blobs	200000	1	0.89	4.13	4.7
blob	no blob	200000	1	0.89	1.31	1.42
col type	datetime	200000	1	0.79	1.84	2.04
col type	varchar	200000	1	0.67	2.03	2
config width	2 cols	200000	1	0.75	1.37	1.37
config width	32 cols	200000	1	1.86	1.45	2.54
config width	8 cols	200000	1	1	1.31	1.59
pk type	float	200000	1	0.92	1.15	1.17
pk type	int	200000	1	0.75	1.36	1.37
pk type	varchar	200000	1	1.54	0.97	0.97
row count	1.6mm	1600000	1	5.56	1.52	1.56
row count	400k	400000	1	1.4	1.44	1.49
row count	800k	800000	1	2.8	1.48	1.53
secondary index	four index	200000	1	3.64	1.08	0.91
secondary index	no secondary	200000	1	0.88	1.38	1.45
secondary index	one index	200000	1	1.1	1.54	1.53
secondary index	two index	200000	1	1.94	1.24	1.14
sorting	shuffled 1mm	1000000	0	5.31	1.8	1.82
sorting	sorted 1mm	1000000	1	5.45	1.78	1.77

[github-actions]

@coffeegoddd DOLT

name	detail	mean_mult
dolt_blame_basic	system table	1.15
dolt_blame_commit_filter	system table	2.77
dolt_commit_ancestors_commit_filter	system table	0.87
dolt_commits_commit_filter	system table	0.9
dolt_diff_log_join_from_commit	system table	1.71
dolt_diff_log_join_to_commit	system table	1.71
dolt_diff_table_from_commit_filter	system table	1.17
dolt_diff_table_to_commit_filter	system table	1.13
dolt_diffs_commit_filter	system table	1
dolt_history_commit_filter	system table	1.46
dolt_log_commit_filter	system table	0.9

[github-actions]

@coffeegoddd DOLT

name	add_cnt	delete_cnt	update_cnt	latency
adds_only	60000	0	0	0.72
adds_updates_deletes	60000	60000	60000	3.77
deletes_only	0	60000	0	1.88
updates_only	0	0	60000	2.41