Add Missing Methods for Changes

[Cliftonz]

Some endpoints of the following section can't be hit from this SDK.

We would like to ensure that all endpoints can be hit. For this issue, we would like to build out the Changes

Some of these methods may already exist. 
If so no need to change/update them, just point out that they already exist and we will close the issue.

This is just to bring every SDK we have on par with all the methods available.

Check all the endpoints here and add the missing ones.

[ShatilKhan]

I'd like to work on this issue. Please assign it to me.

[doomspork]

@ShatilKhan could you start with one ticket and work through that first? Want to make sure we leave opportunities for others and avoid situations where an individual might get busy and as such is unable to complete all of the work