Support DateTime instances

[Tigrov]

Support for array of datetimes will be added after review of #303. Some functionality for casting array values is presented there.

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

[what-the-diff]

PR Summary

• Enhancement to the ColumnSchema Class
  A new function called hasTimezone() has been included to allow the program to check if a specific database column utilizes a timezone.

• Revamp of the Schema Class

  • The property name numeric_precision has been simplified to precision for easier usage.
  • Integration of the abstime data type support has been enforced to handle absolute time data types.
  • The findColumns function was adjusted to retrieve both precision variations (numeric_precision and just precision) from the database.
  • The loadColumnSchema function has been revamped to set the column precision property.
  • Introduced a new function getDateTimeFormat to figure out the format of date/time associated columns.

• Testing and Validation

  • The testing class, ColumnSchemaTest, now includes tests for the new date/time columns and verification of their type casting.

• Improvements in the SchemaProvider Class

  • The class now includes definitions for the newly added date/time columns.

• Changes in the pgsql.sql Fixture File

  • Newly added columns catering for timestamp, timestamptz, date, and time data types have been incorporated.
  • Default values for certain columns have been adjusted.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5359753) 100.00% compared to head (6af8302) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #308   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       200       202    +2     
===========================================
  Files             13        13           
  Lines            598       602    +4     
===========================================
+ Hits             598       602    +4     

Files Changed	Coverage Δ
src/ColumnSchema.php	100.00% <100.00%> (ø)
src/Schema.php	100.00% <100.00%> (ø)

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