Declare visibility on all constants

[bu4ak]

Closes #5103

[codecov]

Codecov Report

Merging #5104 (1702241) into 1.4 (bb07333) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                1.4    #5104   +/-   ##
=========================================
  Coverage     63.26%   63.26%           
  Complexity     1379     1379           
=========================================
  Files           194      194           
  Lines          4064     4064           
=========================================
  Hits           2571     2571           
  Misses         1493     1493           

Impacted Files	Coverage Δ	Complexity Δ
src/Database/Schema/Identifier.php	85.71% <ø> (ø)	2.00 <0.00> (ø)
src/Database/Schema/Index.php	60.00% <ø> (ø)	14.00 <0.00> (ø)
src/Database/Types/Common/CharType.php	0.00% <ø> (ø)	2.00 <0.00> (ø)
src/Database/Types/Common/DoubleType.php	0.00% <ø> (ø)	1.00 <0.00> (ø)
src/Database/Types/Common/JsonType.php	100.00% <ø> (ø)	1.00 <0.00> (ø)
src/Database/Types/Common/NumericType.php	0.00% <ø> (ø)	1.00 <0.00> (ø)
src/Database/Types/Common/TextType.php	100.00% <ø> (ø)	1.00 <0.00> (ø)
src/Database/Types/Common/VarCharType.php	0.00% <ø> (ø)	1.00 <0.00> (ø)
src/Database/Types/Mysql/BinaryType.php	0.00% <ø> (ø)	2.00 <0.00> (ø)
src/Database/Types/Mysql/BitType.php	0.00% <ø> (ø)	3.00 <0.00> (ø)
... and 48 more

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