[r/boards] initialize board creation

[salmad3]

Context:

Board creation is a fundamental operation in r/boards, requiring role-based permission checks to ensure that only authorized users can create boards. Initially, this logic will not depend on an external DAO but will integrate with the DefaultPermissions struct for access control. The board creation logic must include validation of board names, prevention of conflicts with existing usernames in the users realm, and adherence to naming rules.

Acceptance Criteria:

• [ ] Provides a CreateBoard function that validates user permissions.

  Example

  ```go func (bp *BoardsRealm) CreateBoard(user User, boardName string) { bp.WithPermission(user, "create", []interface{}{boardName}, func(args []interface{}) { // Actual board creation logic board := NewBoard(boardName, user) bp.boards[boardName] = board }) } ```
• [ ] Ensure that only users with sufficient permissions (i.e., Owner, Admin) can create a board.
• [ ] Integrates board name validation to prevent conflicts with the users realm and ensure naming conventions.
• [ ] Implements edge case handling:
  • Prevent using wallet addresses as board names.
  • Disallow board names that conflict with usernames unless owned by the creator.
• [ ] Implements callback functions to support potential DAO integration for future extensibility.
• [ ] Ensures integration with DefaultPermissions to manage board creation validation and user roles.
• [ ] Includes unit tests to verify board creation behavior, including name validation and edge cases.