#9325 enhancement: support for 'isNull' logical operator on date field in layer filter

[mahmoudadel54]

Description

It is an enhancement feature added to filter layer from attribute table. Add 'isNull' operator to date field to filter attribute table based on it.

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• [s] Feature

Issue

#9325
What is the current behavior?
There was no operator for 'isNull' for date field
#9325

What is the new behavior?
'isNull' operator is added to the filter layer for date field.

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• No

Other useful information

[allyoucanmap]

The implementation is good, just few changes to apply:

• use disabled prop instead of this.props.operator === "isNull" ? '' : to keep it consistent with string field
• fix failing test

About the disabled prop,
current implementation:

expected:

Note: both UTCDateTimePicker and NumberPicker support disabled prop that could be applied as follow disabled={this.props.operator === "isNull"}

[allyoucanmap]

LGTM

[allyoucanmap]

@ElenaGallo please test this in dev and let us know if we can backport on 2023.02.xx, thanks.
Note: this also introduces isNull operator for numbers, dates, date-time and time

[ElenaGallo]

Test passed, @mahmoudadel54 please backport this to 2023.02.xx.Thanks