Optimize export of large arrays and object graphs

[staabm]

get rid of sprintf saves a lot of memory

before this PR

➜  memopt git:(main) ✗ php vendor/bin/phpunit --no-results

PHPUnit 10.3.5 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.2.10
Configuration: /Users/staabm/workspace/memopt/phpunit.xml.dist

....FFF.............FFFFFFFFFF                                    30 / 30 (100%)

Time: 00:02.630, Memory: 622.16 MB

after this PR

➜  memopt git:(main) ✗ php vendor/bin/phpunit --no-results

PHPUnit 10.3.5 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.2.10
Configuration: /Users/staabm/workspace/memopt/phpunit.xml.dist

....FFF.............FFFFFFFFFF                                    30 / 30 (100%)

Time: 00:02.530, Memory: 522.62 MB

=> ~ 17% memory saving

tested on a https://github.com/gnutix/phpstan-typeinferencetest-memory-exhausted with a few dataproviders removed (as the initial example was too massive to profile)

initial discussion in phpstan/phpstan#9914

[codecov]

Codecov Report

Merging #52 (2939668) into main (a59928a) will not change coverage.
Report is 2 commits behind head on main.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main       #52   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        45        45           
===========================================
  Files              1         1           
  Lines            147       151    +4     
===========================================
+ Hits             147       151    +4     

Files Changed	Coverage Δ
src/Exporter.php	100.00% <100.00%> (ø)

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[staabm]

I don't know what todo about the psalm issue

[sebastianbergmann]

Merged manually, thanks.