api: Add support for device masquerading for appservices

[zecakeh]

According to MSC4326 / Spec PR

Let's do it now since it requires a breaking change.

[github-actions]

The following breaking changes were detected.
Please make sure these are intentional and listed in the respective changelogs.

ruma-common

--- failure trait_method_missing: pub trait method removed or renamed ---
Description:

A trait method is no longer callable, and may have been renamed or removed entirely.

ref: https://doc.rust-lang.org/cargo/reference/semver.html#major-any-change-to-trait-item-signatures

impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.44.0/src/lints/trait_method_missing.ron
Failed in:

method try_into_http_request_with_user_id of trait OutgoingRequestAppserviceExt, previously in file /home/runner/work/ruma/ruma/target/semver-checks/git-origin_main/472a269f064e4ecf21ed05a213215eb16d0538f3/crates/ruma-common/src/api.rs:315