Routing V1 CLI Example

[hacdias]

• Exposes routing/http/client.Client so that users can actually use it across their code.
• Adds Routing V1 CLI example. Added some basic tests.

I will use this example for my talk in IPFS Connect and I thought it was useful to keep here.

[codecov]

Codecov Report

Merging #479 (cb005d8) into main (5ae64f3) will decrease coverage by 0.06%.
The diff coverage is 57.27%.

@@            Coverage Diff             @@
##             main     #479      +/-   ##
==========================================
- Coverage   65.69%   65.64%   -0.06%     
==========================================
  Files         208      209       +1     
  Lines       25099    25196      +97     
==========================================
+ Hits        16488    16539      +51     
- Misses       7152     7189      +37     
- Partials     1459     1468       +9     

Files	Coverage Δ
routing/http/client/client.go	74.59% <100.00%> (ø)
examples/routing/delegated-routing-client/main.go	51.54% <51.54%> (ø)

... and 10 files with indirect coverage changes

[lidel]

lgtm, small nits below