feat: add endpoints for solana waitlist

[clD11]

Summary

This PR implements two endpoints so users can add and remove themselves to a Solana waitlist.

Users who are already linked to Solana should not be able to add themselves to the waitlist.

Closes #2762

Type of Change

• Product feature
• Bug fix
• Performance improvement
• Refactor
• Other

Tested Environments

• Development
• Staging
• Production

Before Requesting Review

• Does your code build cleanly without any errors or warnings?
• Have you used auto closing keywords?
• Have you added tests for new functionality?
• Have validated query efficiency for new database queries?
• Have documented new functionality in README or in comments?
• Have you squashed all intermediate commits?
• Is there a clear title that explains what the PR does?
• Have you used intuitive function, variable and other naming?
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• Have you performed a self review of this PR?

Manual Test Plan

[github-actions]

[puLL-Merge] - brave-intl/bat-go@2761

Description

This PR adds support for a Solana waitlist feature to the bat-go wallet service. It includes new database tables, API endpoints for joining and leaving the waitlist, and various supporting code changes. The changes enable users to register their interest in using Solana functionality before it's fully available.

Changes

Changes

libs/datastore/postgres.go:

• Updated migration version from 69 to 70

migrations/0070_create_solana_waitlist.down.sql & up.sql:

• Added SQL scripts to create and drop the solana_waitlist table
• Table contains payment_id (UUID, primary key) and joined_at (timestamp) columns

services/wallet/datastore.go:

• Added constant depositProviderSolana
• Added isSolana() helper method to CustodianLink

services/wallet/handler/handler.go:

• New file adding Solana handler HTTP endpoints:
  • POST /v3/wallet/solana/waitlist
  • DELETE /v3/wallet/solana/waitlist/{paymentID}

services/wallet/service.go:

• Added Solana waitlist repository interface and functionality
• Added waitlist service methods SolanaAddToWaitlist and SolanaDeleteFromWaitlist
• Updated route registration to include new Solana endpoints

services/wallet/storage/storage.go:

• Added SolanaWaitlist type with methods for inserting and deleting waitlist entries
• Added helper isUniqueConstraintViolation for handling unique constraint errors

sequenceDiagram
    participant Client
    participant API
    participant Service
    participant Database

    %% Join waitlist
    Client->>API: POST /v3/wallet/solana/waitlist
    API->>Service: SolanaAddToWaitlist()
    Service->>Database: Check if already linked
    Service->>Database: Insert into solana_waitlist
    Database-->>Service: Success/Error
    Service-->>API: Response
    API-->>Client: 201 Created / Error

    %% Leave waitlist  
    Client->>API: DELETE /v3/wallet/solana/waitlist/{id}
    API->>Service: SolanaDeleteFromWaitlist()
    Service->>Database: Delete from solana_waitlist
    Database-->>Service: Success/Error
    Service-->>API: Response
    API-->>Client: 200 OK / Error

Loading

[github-actions]

_{reported by reviewdog 🐶}
[semgrep] String-formatted SQL query detected. This could lead to SQL injection if the string is not sanitized properly. Audit this call to ensure the SQL is not manipulable by external data.

Source: https://semgrep.dev/r/go.lang.security.audit.database.string-formatted-query.string-formatted-query


Cc @thypon @kdenhartog

[clD11]

Test code that has been around for ages, file was renamed hence why its coming up now.