Server Side Sort

[Iizuki]

Adding support for the LDAP Server Side Sort extension defined in RFC 2891.

This is done by implementing a couple new controls, a corresponding adapter, and then exposing it in the public API. The API part requires still some thought. Open to suggestions!

I might try to upstream the low level bits to ldap3 crate at some point too, but lets just start here. This will be an invisible change if it does happen in the future.

fixes: #52

[Iizuki]

Okay here's my proposed API @keaz. Basically combining streaming_search_paged and the plain streaming_search into a streaming search that takes the page size and sort options optionally, and uses the corresponding Adapters as necessary. The plain streaming search was anyway just a search with empty adapter Vec under the hood. This way we avoid a lot of duplication.

I'm still going to sit on this for a while longer and test some more but feel free to share your thoughts on this design.

[Iizuki]

Alternatively we could consider some kind of builder api. The streaming search is starting to have quite a bit of parameters.

[keaz]

Is it ok to Panic, shall we return a error?