feat: add flysystem 2 support

[vincentchalamon]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	#113
License	MIT

Backport from #114

[VincentLanglet]

Thanks, I will take a look how to fix this.

[codecov]

Codecov Report

Merging #115 (fefc871) into main (18c185b) will decrease coverage by 4.90%.
The diff coverage is 15.38%.

@@             Coverage Diff              @@
##               main     #115      +/-   ##
============================================
- Coverage     76.96%   72.05%   -4.91%     
- Complexity      220      258      +38     
============================================
  Files            36       40       +4     
  Lines          1033     1120      +87     
============================================
+ Hits            795      807      +12     
- Misses          238      313      +75     

Flag	Coverage Δ
phpunit	72.05% <15.38%> (-4.91%)	⬇️

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

Impacted Files	Coverage Δ
.../Adapter/Builder/LocalAdapterDefinitionBuilder.php	9.09% <0.00%> (-1.44%)	⬇️
src/Controller/Sign.php	94.11% <ø> (ø)
src/EnvelopeBuilder.php	28.09% <ø> (ø)
src/EnvelopeCreator/CreateDocument.php	93.33% <ø> (ø)
src/EnvelopeCreator/EnvelopeCreator.php	73.91% <ø> (ø)
src/Filesystem/AbstractFilesystemDecorator.php	0.00% <0.00%> (ø)
src/Filesystem/FilesystemDecorator.php	5.26% <5.26%> (ø)
src/DependencyInjection/DocusignExtension.php	98.70% <100.00%> (+0.02%)	⬆️
src/Exception/FileNotFoundException.php	100.00% <100.00%> (ø)
src/Filesystem/FilesystemInterface.php	100.00% <100.00%> (ø)
... and 4 more

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[VincentLanglet]

@GregoireHebert Hi, would you have some time to review/merge/release this ? :)

[GregoireHebert]

sorry for the delay, thank you @VincentLanglet and @vincentchalamon :)
just tagged 5.5.0