Various sample http servers

[grcevski]

This PR adds few HTTP servers, built with various languages and technologies. Some support SSL and some not.

We can use these sample programs to test how far we can go with instrumentation.

[mariomac]

Nice! Could we provide Dockerfiles to running them locally without having to install the different toolchains?

[grcevski]

Nice! Could we provide Dockerfiles to running them locally without having to install the different toolchains?

Great idea, I'll add that before I merge the PR. Thanks!

[codecov-commenter]

Codecov Report

Merging #23 (dcf93d2) into main (a120ddb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #23   +/-   ##
=======================================
  Coverage   48.77%   48.77%           
=======================================
  Files          15       15           
  Lines        1060     1060           
=======================================
  Hits          517      517           
  Misses        501      501           
  Partials       42       42           

Flag	Coverage Δ
unittests	48.77% <ø> (ø)

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