add usage parameters

[maha-hajja]

Description

when running ./conduit pipelines desc --help , the Usage doesn't show the required
this PR adds this for all the desc commands, and pipelines init

Quick checks

• I have followed the Code Guidelines.
• There is no other pull request for the same update/change.
• I have written unit tests.
• I have made sure that the PR is of reasonable size and can be easily reviewed.

[raulb]

Thank you @maha-hajja . I'd rather indicate placeholders in capital letters https://developers.google.com/style/placeholders.

e.g.:

describe CONNECTOR_PLUGIN_ID or describe [CONNECTOR_PLUGIN_ID] when optional.

[raulb]

Just updated. Hope you don't mind @maha-hajja so we could ship it earlier.