Refactor ImageKit helper modules and update signatures

- Updated the TransformationUtils and UuidUtils modules to remove the nested Helpers module, making them top-level modules.
- Adjusted method signatures in the Helper class to reflect the new structure.
- Corrected type signatures in RBI and RBS files to match the updated module structure.
- Ensured consistent formatting and organization of transformation constants and methods.

Author: manu4543

lib/imagekit/client.rb

@@ -49,7 +49,7 @@ class Client < Imagekit::Internal::Transport::BaseClient
     # @return [Imagekit::Resources::Webhooks]
     attr_reader :webhooks
 
-    # @return [Imagekit::Helpers::Helper]
+    # @return [Imagekit::Helper]
     attr_reader :helper
 
     # @api private
@@ -123,7 +123,7 @@ def initialize(
       @accounts = Imagekit::Resources::Accounts.new(client: self)
       @beta = Imagekit::Resources::Beta.new(client: self)
       @webhooks = Imagekit::Resources::Webhooks.new(client: self)
-      @helper = Imagekit::Helpers::Helper.new(client: self)
+      @helper = Imagekit::Helper.new(client: self)
     end
   end
 end

lib/imagekit/helpers/crypto_utils.rb

@@ -4,22 +4,21 @@
 require "digest"
 
 module Imagekit
-  module Helpers
-    # Crypto utilities for ImageKit SDK
-    # Provides HMAC-SHA1 functionality for URL signing and authentication
-    module CryptoUtils
-      class << self
-        # Creates an HMAC-SHA1 hash
-        #
-        # @param key [String] The secret key for HMAC generation
-        # @param data [String] The data to be signed
-        # @return [String] Hex-encoded HMAC-SHA1 hash
-        # @raise [StandardError] if HMAC generation fails
-        def create_hmac_sha1(key, data)
-          OpenSSL::HMAC.hexdigest("SHA1", key, data)
-        rescue StandardError => e
-          raise StandardError, "Failed to generate HMAC-SHA1 signature: #{e.message}"
-        end
+  # @api private
+  # Crypto utilities for ImageKit SDK
+  # Provides HMAC-SHA1 functionality for URL signing and authentication
+  module CryptoUtils
+    class << self
+      # Creates an HMAC-SHA1 hash
+      #
+      # @param key [String] The secret key for HMAC generation
+      # @param data [String] The data to be signed
+      # @return [String] Hex-encoded HMAC-SHA1 hash
+      # @raise [StandardError] if HMAC generation fails
+      def create_hmac_sha1(key, data)
+        OpenSSL::HMAC.hexdigest("SHA1", key, data)
+      rescue StandardError => e
+        raise StandardError, "Failed to generate HMAC-SHA1 signature: #{e.message}"
       end
     end
   end