Add functions to Admin API and there response type

[grvn-ht]

Hi !!
I'm using your lib to implement a benthos input for synapse and i needed more Admin API so i implemented it in this pull request.
Tell me if it's ok for you to add theses changes.
Have a nice day,
++

[tulir]

In general totally fine with adding new admin API wrappers, but the code quality needs a bit of improvement. Some of the comments apply to more than one place (I didn't want to repeat the same comment multiple times), so please fix all similar points

[grvn-ht]

Thanks for reviewing, going to fix it

[grvn-ht]

Hi @tulir ,
I made requested changes,
Is everything good or are there still things to do?
Have a nice day!

[tulir]

Looking better, but some fields still need better types and the Messages function has a duplicate. Also check the lint errors that GitHub actions reported (or run pre-commit run -a locally)

[grvn-ht]

Thanks for reviewing @tulir !
Everything up to date now
Except for one lint problem in crypto/olm/account.go
fatal error: olm/olm.h: No such file or directory
But I didn't played with this project's part, it should have already been there
Tell me if you see other things to change in my code!

[tulir]

Ah yeah running pre-commit with -a will run it on all files, which requires libolm-dev to be installed. If you do pre-commit install, it'll check only modified files when running git commit (but that doesn't really help for fixing things after committing).

[grvn-ht]

need more changes or all good?

[sumnerevans]

As Tulir mentioned, the linter must pass.

[grvn-ht]

my local config was missing goimport ^^
now it should be good