RSDK-14456: Add manual mode arm API

[Nicolas Menard (npmenard)]

Adds get_properties, set_manual_mode(manual_mode, enabled_for), and get_manual_mode to the C++ Arm class.

[lia (lia-viam)]

this looks basically fine, although we obviously can't merge until the build is passing. having the new proto files committed in the PR branch seems odd though--have these changes not yet landed in api yet? they should have been picked up by the automated protos update job, hence having no need to make the updates within this PR once the automated PR lands

[Nicolas Menard (npmenard)]

this looks basically fine, although we obviously can't merge until the build is passing. having the new proto files committed in the PR branch seems odd though--have these changes not yet landed in api yet? they should have been picked up by the automated protos update job, hence having no need to make the updates within this PR once the automated PR lands

Yes sorry I should have said something about it in the description. Basically I just wanted to make sure the code as it was would pass the CI but ultimately rebase once the proto changes were merged in the sdk