FN & indexer restore: tool to upload displays to GCS

[gegaowp]

Description

a separate tool to upload displays to GCS which is useful for FN and indexer restore before displays v2 is in place, more details are in README

Test plan

• cargo test
• local run with GCS credentials and verify on GCS

---

Release notes

Check each box that your changes affect. If none of the boxes relate to your changes, release notes aren't required.

For each box you select, include information after the relevant heading that describes the impact of your changes that a user might notice and any actions they must take to implement updates.

• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] gRPC:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK: