Element specific well-known support

[stefanceriu]

Handles part of element-hq/element-meta/issues/2441

• exposes a generic method to make GET requests throgh the SDKs internal HTTP client. This avoids various configuration differences between the SDK stack and that of the client
• exposes a way to read the server name part of the current user's identifier (already built into ruma, make sense to use it across clients)
• adds an Element specific well-known struct that the FFI clients can use to deserialize a response JSON

Powers element-hq/element-x-ios#2971

[bnjbvr]

exposes a generic method to make GET requests throgh the SDKs internal HTTP client. This avoids various configuration differences between the SDK stack and that of the client

I'm a bit curious, what kind of requests are you doing outside the SDK? 👀

[stefanceriu]

I'm a bit curious, what kind of requests are you doing outside the SDK? 👀

Have a look at the linked issue and ElementX PR
tl;dr; fetching Element specific configs from a file

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.19%. Comparing base (1c92633) to head (d505ad1).
Report is 1 commits behind head on main.

Files	Patch %	Lines
crates/matrix-sdk/src/client/mod.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3617      +/-   ##
==========================================
+ Coverage   84.17%   84.19%   +0.02%     
==========================================
  Files         255      255              
  Lines       26515    26517       +2     
==========================================
+ Hits        22319    22327       +8     
+ Misses       4196     4190       -6     

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[poljar]

I think that this is simple enough and fine for now, though we really need to start thinking about a Element specific crate more seriously.

Left a small nit.