Make SDK more typesafe

[lforst]

We are using an ungodly amount of any everywhere and this makes it either slightly dodgy to change things or requires extra verification.

Suggestion to improve things from the outside in:

• Add vendored types for all of the libraries we wrap and immediately typecast the input inside the wrapper function body so we can pass around stuff in a type-safe way.
• Find a way to properly to type our plugin system for auto-instrumentation so that we can assume we know what shapes we're getting when listening to channels.

Vendored types:

• wrapOpenAI ref: Add vendored types for OpenAI sdk instrumentation #1514
• wrapAnthropic ref: Add vendored types for anthropic instrumentation #1503
• wrapGoogleGenAI ref: Add vendored types for google genai instrumentation #1506
• wrapClaudeAgentSDK ref: Add vendored types for claude agent sdk instrumentation #1505
• wrapAISDK ref: Add vendored types for ai sdk instrumentation #1508

After that's done:

• Make Plugin System type safe ref: Properly type tracing channels #1517