Support StringableStream instances

[Tigrov]

Related PR

• Change BinaryColumn::phpTypecast() to return StringableSteam|string|null db#1013

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌
Fixed issues

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.78%. Comparing base (386ef1d) to head (bee5ba4).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #349   +/-   ##
=========================================
  Coverage     97.78%   97.78%           
  Complexity      233      233           
=========================================
  Files            23       23           
  Lines           767      769    +2     
=========================================
+ Hits            750      752    +2     
  Misses           17       17           

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