Add .Net support

[kolesnikovae]

The change introduces support for .Net CPU time profiling.

dotnetspy uses Diagnostic IPC Protocol client to communicate to .Net runtime and gather trace events. It is important to note that only managed code is accounted. Refer to dotnetdiag package for implementation details.

Supported versions:

• .Net 5.0
• .Net Core 3.1

Examples:

• web - a web app that listens on :5000/tcp and performs some calculations.
• fast-slow - a single thread application similar to examples for other runtimes:

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #200 (18b9cd8) into main (812ca3f) will decrease coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
- Coverage   57.49%   57.29%   -0.19%     
==========================================
  Files          73       73              
  Lines        2938     2943       +5     
==========================================
- Hits         1689     1686       -3     
- Misses       1106     1112       +6     
- Partials      143      145       +2     

Impacted Files	Coverage Δ
pkg/agent/session.go	63.94% <ø> (-3.27%)	⬇️
pkg/agent/spy/spy.go	5.00% <ø> (ø)
pkg/analytics/analytics.go	86.96% <100.00%> (+0.20%)	⬆️
pkg/convert/parser.go	62.80% <0.00%> (-3.06%)	⬇️
pkg/server/ingest.go	63.39% <0.00%> (-1.83%)	⬇️

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[petethepig]

Everything looks good, merging