fix(cloudflare)!: add better type handling for additional context

[chanceaclark]

What/Why?

Adds better handling of Cloudflare context for types. Using any and unknown in an interface was causing type mismatch, so even though it's more verbose, we should match the types needed from Cloudflare:

Noticed a v9 is coming soon, so thought it's a good opportunity to add a BC now.

BREAKING CHANGE:
Updates the cloudflare withSentry handler generic type to allow passing in additional types used by ExportedHandler.

Before:

Sentry.withSentry<ExportedHandler<Env>>(...)

After:

Sentry.withSentry<Env>(...)

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