Adds PHP support via phpspy

[petethepig]

TODO:

• set up C library scaffolding, make phpspy code compile into a static library.
• connect the interface with the actual profiling code
• connect C library with go code

Instructions

These are instructions on how to test changes in this PR

Setup

• clone pyroscope repo

git clone https://github.com/pyroscope-io/pyroscope

• clone phpspy library repo

git clone https://github.com/pyroscope-io/phpspy

Test Changes

To test changes you make in phpspy repo:

• first, build phpspy library:

cd phpspy
docker build . --tag pyroscope/phpspy:dev

• second, build a new pyroscope version:

cd pyroscope
docker build . --tag pyroscope/pyroscope:dev

• third, build and run the example application with the new pyroscope version:

cd pyroscope/examples/php
docker-compose build && docker-compose up

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@e098d77). Click here to learn what that means.
The diff coverage is 66.67%.

@@           Coverage Diff           @@
##             main     #157   +/-   ##
=======================================
  Coverage        ?   57.29%           
=======================================
  Files           ?       73           
  Lines           ?     2938           
  Branches        ?        0           
=======================================
  Hits            ?     1683           
  Misses          ?     1112           
  Partials        ?      143           

Impacted Files	Coverage Δ
pkg/agent/session.go	63.94% <ø> (ø)
pkg/agent/spy/spy.go	5.00% <0.00%> (ø)
pkg/analytics/analytics.go	83.83% <100.00%> (ø)

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