Python SDK Truncation Logic

[szokeasaurusrex]

Implement parent issue for Python SDK

What is currently being trimmed (@sentrivana to provide a comprehensive list):

• request bodies (default: "medium", can be exempted from trimming with "always")
• databags (affects local vars too, max breadth: 10, max_depth: 5)
• max value length (trims strings, default: 100 000, (before: 1024, but we increased this because we were trimming ai messages))
• breadcrumbs (max 100)
• transport queue (max 100)
• spans in a transaction (max 1000)
• some integrations have additional trimming logic (Redis: 1024 max data size)

See also:

• Remove event data trimming #3310
• ref: Remove MAX_EVENT_BYTES #4630
• [do not merge] Remove databag trimming #4645