[FEATURE] TXE: Support additional scopes in `TestEnvironment::call_private`

[ilpepepig]

Problem Statement

TestEnvironment.call_private(from, call) currently scopes private state access exclusively to the from address. There is no way to grant visibility to additional addresses' notes during execution, unlike the JS/TS SDK which supports additionalScopes in send() options.

This makes it impossible to test flows where a contract accesses another contract's private notes, such as escrow contracts that hold token notes.

Proposed Solution

No response

Example Use Case

No response

Alternative Solutions

No response

Additional Context

v4.2.0-aztecnr-rc.2