Add Ability for Agents to do Webpage Retrieval

[tmichaeldb]

This PR uses our new Knowledge Base PUT endpoints to insert webpages into a Knowledge Base, and connect it to an agent using our new retrieval skill.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mindsdb_sdk
agents.py	144	35	76%	21, 80, 88, 96, 99, 103, 105, 107, 109, 111, 181–188, 192, 197–201, 230, 235–239, 276–278, 299–301, 305–309
databases.py	42	2	95%	107, 134
handlers.py	39	1	97%	77
jobs.py	97	7	93%	41, 53, 81, 85, 147–150
knowledge_bases.py	126	15	88%	58–61, 151, 155–162, 167–171, 250–253, 322, 339
ml_engines.py	42	3	93%	94, 126, 128
models.py	211	19	91%	109, 140–141, 222, 231, 233, 303, 339, 348, 372, 403, 497, 505, 524, 540, 548, 573, 577, 590
projects.py	63	1	98%	167
query.py	13	1	92%	14
skills.py	53	3	94%	43, 45, 49
tables.py	130	15	88%	140–142, 145, 165, 192, 203–204, 209, 224, 227, 321, 342–347, 356, 376
views.py	37	2	95%	105, 138
mindsdb_sdk/connectors
rest_api.py	184	21	89%	16–26, 32–33, 48, 69–71, 92, 95, 102–105, 163–164
TOTAL	1269	125	90%

Tests	Skipped	Failures	Errors	Time
16	0 💤	0 ❌	0 🔥	9.102s ⏱️

[dusvyat]

lgtm!