Feature signals

[AydinHassan]

Allow attaching to system signals.

• Add a default handler for resizing and refresh the terminal size.
• Implement non blocking stream reading so we don't block on fread and therefore signal handlers will be executed.
• Upgrade phpstan and fix some issues

@mikeymike I know this is old but do you remember what you wanted to do with this before finishing it?

[codecov-io]

Codecov Report

Merging #12 into master will decrease coverage by 6.94%. The diff coverage is 60%.

@@             Coverage Diff              @@
##             master      #12      +/-   ##
============================================
- Coverage     80.74%   73.79%   -6.95%     
- Complexity       85       98      +13     
============================================
  Files             7        8       +1     
  Lines           161      187      +26     
============================================
+ Hits            130      138       +8     
- Misses           31       49      +18

Impacted Files	Coverage Δ	Complexity Δ
src/IO/BufferedOutput.php	81.81% <ø> (ø)	5 <0> (ø)	:arrow_down:
src/IO/NonBlockingResourceInputStream.php	0% <0%> (ø)	3 <3> (?)
src/IO/ResourceInputStream.php	84.61% <100%> (+1.28%)	8 <6> (+1)	:arrow_up:
src/IO/ResourceOutputStream.php	83.33% <100%> (+1.51%)	8 <6> (+1)	:arrow_up:
src/InputCharacter.php	100% <100%> (ø)	12 <0> (ø)	:arrow_down:
src/NonCanonicalReader.php	90.47% <66.66%> (-4.27%)	11 <4> (+2)
src/UnixTerminal.php	64.21% <68.42%> (-5.79%)	49 <8> (+6)

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