functionality for registering on behalf of a client

[zgai1717]

Overview:

This PR adds functionality for the 'register-on-behalf-of' feature, which relies on the auxiliary functionality added in the conjure repo. This feature allows users to register on behalf of a client by specifying the client's IP using the -register-for flag.

Changes:

• Added a new flag: -register-for, to support registering on behalf of a client.
• Modified the bdapi registration flow to align with changes in the conjure repo.

Dependencies:

This PR depends on the changes made in conjure repo PR #279. Please ensure that the conjure PR is merged first before reviewing this one.

Testing:

• Tested using an AWS instance, registering on behalf of the instance using its IPv4 address with the -register-for flag.
• Verified that the new functionality integrates well with the existing codebase.