proxy: v2.128.0 (#5531)

This release primarily features an upgrade to the Tokio v1 ecosystem.

Additionally, the `LINKERD2_PROXY_TAP_DISABLED` configuration is no
longer honored. Now, the proxy's Tap API is disabled by default and it
is only enabled when the `LINKERD2_PROXY_TAP_SVC_NAME` configuration is
set (when identity is not disabled for the proxy).

---

* Add a license to all cargo manifests (linkerd/linkerd2-proxy#832)
* Remove dependency on tower-request-modifier (linkerd/linkerd2-proxy#829)
* Update ipnet to v2 (linkerd/linkerd2-proxy#830)
* Remove the unused app-profiling crate (linkerd/linkerd2-proxy#827)
* update to Tokio 1.0 (linkerd/linkerd2-proxy#826)
* Use cargo-deny to audit dependencies (linkerd/linkerd2-proxy#833)
* Rename crates to reflect directory structure (linkerd/linkerd2-proxy#834)
* Represent local identity as an Option (linkerd/linkerd2-proxy#836)
* Split linkerd-tls from linkerd-proxy-transport (linkerd/linkerd2-proxy#837)
* stack: use `LayerFn` from upstream (linkerd/linkerd2-proxy#840)
* Remove tap status being explicitly set in config (linkerd/linkerd2-proxy#838)
* Split linkerd-detect from linkerd-proxy-transport (linkerd/linkerd2-proxy#841)