add Stringable implement for Fragment and ActiveQuery

[aquaminer]

No description provided.

[aquaminer]

should this also be added to other classes with _toString is implemented?

[codecov]

Codecov Report

Merging #52 (077958b) into 2.x (11cf9d6) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x      #52      +/-   ##
============================================
- Coverage     92.67%   92.66%   -0.02%     
+ Complexity     1526     1520       -6     
============================================
  Files            93       94       +1     
  Lines          3961     3858     -103     
============================================
- Hits           3671     3575      -96     
+ Misses          290      283       -7     

Impacted Files	Coverage Δ
src/Injection/Fragment.php	94.11% <ø> (ø)
src/Query/ActiveQuery.php	93.93% <ø> (ø)
src/Driver/MySQL/Schema/MySQLTable.php	91.04% <0.00%> (-0.39%)	⬇️
src/Driver/SQLServer/SQLServerHandler.php	92.30% <0.00%> (-0.29%)	⬇️
src/Query/Interpolator.php	89.18% <0.00%> (-0.29%)	⬇️
src/Driver/Postgres/PostgresHandler.php	95.65% <0.00%> (-0.19%)	⬇️
src/Driver/Postgres/Schema/PostgresTable.php	94.56% <0.00%> (-0.18%)	⬇️
src/Driver/MySQL/Schema/MySQLColumn.php	92.00% <0.00%> (-0.16%)	⬇️
src/Schema/Reflector.php	90.14% <0.00%> (-0.14%)	⬇️
src/Driver/CompilerCache.php	88.48% <0.00%> (-0.09%)	⬇️
... and 34 more

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