Add ZEC shielded memo parsing

Itzamnarequested to merge
feat/zec-shielded-memo into develop

Closes #219 (closed)

Implements TC MR - Cache responses for Bifrost get thorchain/thornode!3182 (merged)

Summary by CodeRabbit

  • New Features

    • ZEC shielded memo support: send/decrypt Sapling & Orchard memos, derive inbound shielded info/IVKs, and expose shielded memo config on inbound addresses/APIs.

  • Performance

    • Per-endpoint HTTP response caching to reduce repeated network calls.

  • Bug Fixes

    • Block-height handling simplified to always fetch latest height.

  • Documentation

    • Added detailed ZEC inbound shielded memo feature guide.

  • Chores

    • API bumped to v1.125.0 and new configuration constants added.

  • Tests

    • Expanded tests and fixtures covering shielded memo flows and decryption.
Edited by Code Rabiit

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