Enable CLI by default

[bwoebi]

And enable autoflushing by default in CLI environments.

Especially with SSI, this enables us to actually instrument CLI scripts transparently as well.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.91%. Comparing base (ee973a5) to head (22a6b6d).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2871   +/-   ##
=========================================
  Coverage     80.91%   80.91%           
  Complexity     2526     2526           
=========================================
  Files           146      146           
  Lines         14706    14706           
=========================================
  Hits          11900    11900           
  Misses         2806     2806           

Flag	Coverage Δ
tracer-extension	78.10% <ø> (ø)
tracer-php	82.10% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ee973a5...22a6b6d. Read the comment docs.

[iamluc]

I wonder if we should set the default value to auto (or create a new ini config), which would be paired with an allow/deny list.

For example, I don’t think we should enable it by default for composer 🤔

[bwoebi]

@iamluc that's reasonable and probably the only exception I can think of. "if name == composer or composer.phar"...