Support DateTime instances

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	✔️
Fixed issues	#725

[what-the-diff]

PR Summary

• Enhanced ColumnSchemaInterface with a dateTimeFormat method
  The ColumnSchemaInterface class in Schema.php now includes a new method dateTimeFormat for better handling of date and time formats.

• Revised default value handling in normalizeDefaultValue method
  The normalizeDefaultValue method in Schema.php has been tweaked to support varied default values for date and time, assisted by the newly introduced dateTimeFormat.

• Improved testing for new date and time PHP typecasting
  New tests have been added to ColumnSchemaTest.php to ensure the effective functioning of PHP typecasting for date and time.

• Advanced column additions in SchemaProvider.php
  The columns method in Provider/SchemaProvider.php has been updated to add columns featuring unique default values for date and time.

• Improved assertions in testing
  Assertions in the testAlternativeDisplayOfDefaultCurrentTimestampInMariaDB method of SchemaTest.php file have been revised to make comparisons against an Expression object.

• Modified testing methodology for new date and time default values
  The testDefaultValueDatetimeColumn method in SchemaTest.php has been tweaked to test the newly added date and time default values.

• Updated default values in mysql.sql
  The default values of the timestamp_col, datetime_col, date_col and time_col columns, contained in tests/Support/Fixture/mysql.sql, have been updated.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (463bab4) 99.11% compared to head (45fab61) 99.11%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #298   +/-   ##
=========================================
  Coverage     99.11%   99.11%           
+ Complexity      191      190    -1     
=========================================
  Files            13       13           
  Lines           565      566    +1     
=========================================
+ Hits            560      561    +1     
  Misses            5        5           

Files Changed	Coverage Δ
src/Schema.php	99.63% <100.00%> (+<0.01%)	⬆️

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