fix: GCS folder support

[IvanPsurtcev]

Description

This PR fixes the problem of this issue:
https://github.com/hyperlane-xyz/hyperlane-monorepo/issues/4449
The change was only in the gcs_storage.rs file. Slightly tweaked methods so that you can write files to a specified folder in the terminal.

When trying to run a validator specifying checkpointSyncer settings for GCS:
--checkpointSyncer.type gcs --checkpointSyncer.bucket an-s3-signatures-repository --checkpointSyncer.folder atletaolympia

Building provider without signer
thread 'main' panicked at 'Failed to report agent metadata: error validating bucket name an-s3-signatures-repository/atletaolympia

Caused by:
    Character '/' @ 27 is not allowed

Location:
    hyperlane-base/src/types/gcs_storage.rs:181:9', agents/validator/src/validator.rs:178:14

To solve this problem I added the folder: Option<String> field to the GcsStorageClient structure, I also added bucket and folder processing to the impl CheckpointSyncer, GcsStorageClientBuilder methods

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Latest commit: e543e26

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[sapph1re]

@tkporter @daniel-savu 👀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.27%. Comparing base (f26453e) to head (e543e26).
Report is 1 commits behind head on main.

Additional details and impacted files

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[daniel-savu]

nice, so the TL;DR is that GCS has no notion of folders and you just prepend it to the object key?

[sapph1re]

nice, so the TL;DR is that GCS has no notion of folders and you just prepend it to the object key?

GCS does have folders, but the existing code for GCS doesn't work with them correctly. That's why @IvanPsurtcev has made this addition to support folders like they are for AWS.

This is actually quite essential, because running multiple validators on one bucket requires them using different folders.

[daniel-savu]

thank you!

[daniel-savu]

@IvanPsurtcev I think merging main will fix CI

[IvanPsurtcev]

@IvanPsurtcev I think merging main will fix CI

@daniel-savu Done