Python: improved MCP connect and additional samples

[eavanvalkenburg]

Motivation and Context

Adding a sample using StreamableHTTPServer towards Github.
Added a demo showing how to connect to a OAuth protected MCP server.
Also some improvements in the connect logic for MCP.

Description

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[moonbox3]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
__init__.py	4	0	100%
connectors
mcp.py	419	203	51%	75, 87, 95–102, 108–109, 114, 126–133, 141–145, 147–148, 150, 157–159, 244–250, 285–287, 292–294, 308–309, 312–313, 321–323, 335–336, 340–341, 343, 345, 347–353, 357–359, 361–371, 375–376, 380–381, 385, 387, 391–392, 396, 410, 425–433, 439–440, 442–443, 446–447, 453–454, 469–470, 473–474, 477–482, 486–487, 490–491, 494–500, 574, 576, 643, 645, 647, 649, 718, 720, 722, 724, 726, 784, 827–832, 834–837, 842, 895, 897, 900, 913, 933–935, 942–947, 950–952, 955, 957, 961–962, 964, 967–968, 977–978, 980–982, 996–997, 999–1000, 1002–1004, 1007, 1014–1017, 1025, 1030–1035, 1040, 1042, 1045–1048
connectors/ai/hugging_face/services
hf_text_completion.py	60	3	95%	103, 112, 127
TOTAL	26661	4578	82%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3654	22 💤	0 ❌	0 🔥	1m 57s ⏱️

[TaoChenOSU]

I think in general we still need to copyright header in demo application code.