[CWL Executor] Any reason for not inheriting from the `Hint` class as the other hints? (another reason to move them in the same module or directory).

[ryuwd]

Any reason for not inheriting from the Hint class as the other hints? (another reason to move them in the same module or directory).

Originally posted by @aldbr in #94 (comment)

[ryuwd]

Duplicate of #105