Load component dependencies directly

[OskarEichler]

The packaged component entry points are not self-contained:

• require 'rainbow/color' raises because X11ColorNames has not been loaded.
• require 'rainbow/null_presenter' can construct the class, but named-color dispatch raises because Color has not been loaded.

Require each direct dependency from the component that uses it. Normal require 'rainbow' behavior and load order remain unchanged.

Verification:

• release/master fail both isolated-process component checks; this branch passes all four checks on Ruby 3.2.11 and 4.0.6
• full suite: 220 examples / 0 failures on both Rubies
• 15-file RuboCop run: 0 offenses on both Rubies
• rebuilt 14-file gem passes the packaged component models

No API break; direct documented/package entry points become independently loadable.