feat(ee): Captain custom http tools (#12584)

To test this out, use the following PR:
https://github.com/chatwoot/chatwoot/pull/12585

---------

Co-authored-by: Pranav <pranavrajs@gmail.com>

enterprise/app/models/concerns/toolable.rb

@@ -0,0 +1,78 @@
+module Concerns::Toolable
+  extend ActiveSupport::Concern
+
+  def tool(assistant)
+    custom_tool_record = self
+
+    tool_class = Class.new(Captain::Tools::HttpTool) do
+      description custom_tool_record.description
+
+      custom_tool_record.param_schema.each do |param_def|
+        param param_def['name'].to_sym,
+              type: param_def['type'],
+              desc: param_def['description'],
+              required: param_def.fetch('required', true)
+      end
+    end
+
+    tool_class.new(assistant, self)
+  end
+
+  def build_request_url(params)
+    return endpoint_url if endpoint_url.blank? || endpoint_url.exclude?('{{')
+
+    render_template(endpoint_url, params)
+  end
+
+  def build_request_body(params)
+    return nil if request_template.blank?
+
+    render_template(request_template, params)
+  end
+
+  def build_auth_headers
+    return {} if auth_none?
+
+    case auth_type
+    when 'bearer'
+      { 'Authorization' => "Bearer #{auth_config['token']}" }
+    when 'api_key'
+      if auth_config['location'] == 'header'
+        { auth_config['name'] => auth_config['key'] }
+      else
+        {}
+      end
+    else
+      {}
+    end
+  end
+
+  def build_basic_auth_credentials
+    return nil unless auth_type == 'basic'
+
+    [auth_config['username'], auth_config['password']]
+  end
+
+  def format_response(raw_response_body)
+    return raw_response_body if response_template.blank?
+
+    response_data = parse_response_body(raw_response_body)
+    render_template(response_template, { 'response' => response_data })
+  end
+
+  private
+
+  def render_template(template, context)
+    liquid_template = Liquid::Template.parse(template, error_mode: :strict)
+    liquid_template.render(context.deep_stringify_keys, registers: {}, strict_variables: true, strict_filters: true)
+  rescue Liquid::SyntaxError, Liquid::UndefinedVariable, Liquid::UndefinedFilter => e
+    Rails.logger.error("Liquid template error: #{e.message}")
+    raise "Template rendering failed: #{e.message}"
+  end
+
+  def parse_response_body(body)
+    JSON.parse(body)
+  rescue JSON::ParserError
+    body
+  end
+end