Rename namespace alias with API / CLI

**Is your feature request related to a problem? Please describe.**

In the Editor integration I can point to a namespace alias and then rename it. But this feature is not exposed to the public API.

**Describe the solution you'd like**

***Option A:***

```clojure
(clojure-lsp.api/rename-ns-alias!
{:target-namespace 'clojure.string
:alias 'str })
```
Running this on the project, would unify the alias to `clojure.string` in all files.

***Option B:***

```clojure
(clojure-lsp.api/rename-ns-alias!
{:from 'clojure-string
:to 'str})
```

This would only match an existing alias `clojure-string` and rename it, independent of the target namespace it points to.