Fix extension issues

[acquamarin]

Description

Closes #4004: Give better error message in extension:
Closes #4006: Give better error message in non-empty wal
Closes #4009: Add default name for unaliased database

Add tests for http_file_cache in a single transaction.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.15%. Comparing base (eccab34) to head (2972ddd).
Report is 3 commits behind head on master.

Files	Patch %	Lines
src/main/attached_database.cpp	0.00%	2 Missing ⚠️
src/processor/operator/simple/attach_database.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4011      +/-   ##
==========================================
- Coverage   85.16%   85.15%   -0.01%     
==========================================
  Files        1297     1297              
  Lines       50640    50646       +6     
  Branches     6946     6949       +3     
==========================================
+ Hits        43128    43130       +2     
- Misses       7382     7386       +4     
  Partials      130      130              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

Benchmark Result

Master commit hash: 1f75636b48a2d134ae9668f4188ba850045c2c55
Branch commit hash: f0624910aea419a3a68f9939e33fa5f96c9300c0

Query Group	Query Name	Mean Time - Commit (ms)	Mean Time - Master (ms)	Diff
aggregation	q24	664.47	657.89	6.58 (1.00%)
aggregation	q28	11731.04	11456.97	274.07 (2.39%)
filter	q14	144.14	136.03	8.11 (5.96%)
filter	q15	143.43	134.44	8.99 (6.69%)
filter	q16	330.86	306.82	24.05 (7.84%)
filter	q17	466.84	459.71	7.13 (1.55%)
filter	q18	1969.70	1910.40	59.30 (3.10%)
fixed_size_expr_evaluator	q07	582.02	573.54	8.48 (1.48%)
fixed_size_expr_evaluator	q08	807.08	798.68	8.41 (1.05%)
fixed_size_expr_evaluator	q09	802.91	798.85	4.06 (0.51%)
fixed_size_expr_evaluator	q10	256.90	249.81	7.09 (2.84%)
fixed_size_expr_evaluator	q11	251.32	247.15	4.17 (1.69%)
fixed_size_expr_evaluator	q12	252.40	243.92	8.48 (3.48%)
fixed_size_expr_evaluator	q13	1498.09	1489.41	8.68 (0.58%)
fixed_size_seq_scan	q23	137.63	126.67	10.96 (8.65%)
join	q31	50.05	39.47	10.58 (26.80%)
ldbc_snb_ic	q35	3501.65	3969.51	-467.86 (-11.79%)
ldbc_snb_ic	q36	137.54	122.18	15.36 (12.57%)
ldbc_snb_is	q32	9.73	10.60	-0.87 (-8.20%)
ldbc_snb_is	q33	97.84	98.03	-0.19 (-0.19%)
ldbc_snb_is	q34	95.21	90.78	4.43 (4.88%)
multi-rel	multi-rel-large-scan	2692.05	2663.65	28.39 (1.07%)
multi-rel	multi-rel-lookup	69.30	83.57	-14.27 (-17.08%)
multi-rel	multi-rel-small-scan	58.57	56.90	1.67 (2.93%)
order_by	q25	147.11	136.11	10.99 (8.08%)
order_by	q26	455.61	460.01	-4.41 (-0.96%)
order_by	q27	1422.48	1413.16	9.32 (0.66%)
scan_after_filter	q01	184.75	183.18	1.58 (0.86%)
scan_after_filter	q02	181.75	172.56	9.18 (5.32%)
shortest_path_ldbc100	q39	119.99	122.08	-2.09 (-1.71%)
var_size_expr_evaluator	q03	2072.58	2055.45	17.13 (0.83%)
var_size_expr_evaluator	q04	2280.39	2245.80	34.60 (1.54%)
var_size_expr_evaluator	q05	2558.64	2536.86	21.78 (0.86%)
var_size_expr_evaluator	q06	1386.30	1355.50	30.80 (2.27%)
var_size_seq_scan	q19	1493.09	1472.26	20.83 (1.41%)
var_size_seq_scan	q20	3172.65	3157.52	15.12 (0.48%)
var_size_seq_scan	q21	2386.36	2444.23	-57.87 (-2.37%)
var_size_seq_scan	q22	132.12	129.44	2.68 (2.07%)