[FEA] Refactor ORC's dictionary encoding using cuCo

[devavret]

ORC writer uses dictionary encoding on string columns and uses a custom hash map like structure. This is not needed anymore as we can use cuCo's hash maps.

Using #8476 as a template, we should be able to refactor and clean up the dictionary encoding code that currently resides in src/io/orc/dict_enc.cu

[github-actions]

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[PointKernel]

Still relevant

[github-actions]

This issue has been labeled inactive-30d due to no recent activity in the past 30 days. Please close this issue if no further response or action is needed. Otherwise, please respond with a comment indicating any updates or changes to the original issue and/or confirm this issue still needs to be addressed. This issue will be labeled inactive-90d if there is no activity in the next 60 days.

[github-actions]

This issue has been labeled inactive-90d due to no recent activity in the past 90 days. Please close this issue if no further response or action is needed. Otherwise, please respond with a comment indicating any updates or changes to the original issue and/or confirm this issue still needs to be addressed.