feat: Add Utility SDK Functions

[maticzav]

This PR adds utility functions to Browser Use SDK.

[delve-auditor]

⚠️ Error occurred during scan. The security scan encountered an error and could not complete. Reviewed up to 492c7a8.

Detected Code Changes

Change Type	Relevant files
Enhancement	► tasks.py     Add run, stream and watch methods ► lib/parse.py     Add parsing utility functions ► types/llm_model.py     Add LLM model type definitions ► examples/     Add example implementations
Configuration changes	► .stats.yml     Update OpenAPI spec URLs and hashes

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