Python: Support Bing Custom Search

[bochris]

Motivation and Context

Update BingConnector to add support for Bing Custom Search, which can be used to specify domains and webpages to search and allows custom ranking adjustments.

Description

Note that API keys for Bing are separate from Bing Custom Search.

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 😄

[markwallace-microsoft]

Python 3.10 Test Coverage Report •

File	Stmts	Miss	Cover	Missing
semantic_kernel/connectors/search_engine
bing_connector.py	33	33	0%	3–76
bing_connector_settings.py	6	6	0%	3–25
TOTAL	6098	786	87%

Python 3.10 Unit Test Overview

Tests	Skipped	Failures	Errors	Time
1403	1 💤	0 ❌	0 🔥	23.082s ⏱️

[moonbox3]

@bochris a change went in today to introduce a pre-commit check. Please make sure you've downloaded the pre-commit package either from pip or via Poetry. You'll need to run the pre-commit install on the root level of the repo. Then, when you make a commit from the command line to fix this, you will see the checks run.