feat(coap-server): add support for URI variables

[JKRhb]

Resolves #1015.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% 🎉

Comparison is base (c8177c2) 75.02% compared to head (2bc9e19) 75.06%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1078      +/-   ##
==========================================
+ Coverage   75.02%   75.06%   +0.03%     
==========================================
  Files          80       80              
  Lines       15610    15622      +12     
  Branches     1499     1498       -1     
==========================================
+ Hits        11712    11727      +15     
+ Misses       3862     3859       -3     
  Partials       36       36              

Files Changed	Coverage Δ
packages/binding-coap/src/coap-server.ts	79.02% <100.00%> (+0.71%)	⬆️
packages/binding-http/src/http-server.ts	83.25% <100.00%> (-0.41%)	⬇️
packages/core/src/helpers.ts	83.00% <100.00%> (+0.74%)	⬆️

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[JKRhb]

Thank you for your approval, @egekorkan :) In the last two commits, I applied some additional refactoring/simplification, the functionality itself should remain unchanged, though.

[danielpeintner]

LGTM

[JKRhb]

LGTM

Thank you! Is it okay for you to squash the fixup commits and then merge the PR? Or would you prefer the squash + merge approach (i.e., squashing all commits into one)?

[danielpeintner]

I would "squash and merge" once we merge the PR.
I like this way best since it keeps the history of the PR till to the end and the final commit is clean when it gets merged into the master...

[relu91]

Well Done!