Extract transaction-context crate

[kevinheavey]

Problem

solana_sdk::transaction_context imposes a solana_sdk dep on solana_transaction_status_client_types

Summary of Changes

• Move to its own crate and re-export with deprecation notice
• transaction_context.rs was making use of the full feature of solana-sdk for code using debug_assertions. Add a debug_assertions feature to the new crate to replace the full feature.
• Make serde and bincode optional in the new crate
• Add doc_auto_cfg like in add doc_auto_cfg to relevant sdk crates #3121