Support JSON type

[Tigrov]

Related PR

• Refactor array, structured and JSON expressions. db#929

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

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.16%. Comparing base (d92d19f) to head (5c167b9).

Files with missing lines	Patch %	Lines
src/Schema.php	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #342      +/-   ##
============================================
+ Coverage     98.12%   98.16%   +0.04%     
- Complexity      222      228       +6     
============================================
  Files            19       19              
  Lines           692      709      +17     
============================================
+ Hits            679      696      +17     
  Misses           13       13              

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