pymemcache query sanitization

[avzis]

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Description

Added a query sanitizer to the Pymemcache instrumentation. Default False, can be enabled with sanitize_query = True

This will allow users to sanitize the query. PymemcacheInstrumentor().instrument(sanitize_query=True)

Fixes #1546

How Has This Been Tested?

• [x] Original tests remained un-changed, and they will validate the original queries.
• [x] Added a test that validates a sanitized query.

Does This PR Require a Core Repo Change?

• [x] No.

Checklist:

• [x] Changelogs have been updated
• [x] Unit tests have been added
• [x] Documentation has been updated