Ogc during next

[matrottier]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines:https://github.com/infra-geo-ouverte/igo2/blob/master/.github/CONTRIBUTING.md#git-commit-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What is the current behavior? (You can also link to an open issue here)
ogc filter "During" use "string" as input

What is the new behavior?
ogc filter "During" use calendar as input

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications:

Other information:

[pelord]

1. Review the placement of during operator into the sidenav panel
   

[pelord]

2. Develop a method for same single date. Where the begin/end are the same.

[pelord]

3. Does the time stepDate (P2D, PT4H, P1M...) should be proposed as a option to the user? i.e. a select?

[pelord]

4. Why these properties are at the datasource level?

   minDate: '2016-01-01T00:00:00-05:00',
   maxDate: '2018-12-31T00:00:00-05:00',
   stepDate: 'P1M'

[pelord]

5. Add an example into the igo2 demo.

[matrottier]

1- working on this
2- we must add a option, idea for the name ? in this case, we do not display the End Time because it will be start time + step.
3- maybe in advance mode. You must calculate all the possiblity of the WMS with the step. more complicate.
4- i saw it like the zoom option. it's the max/min of the datasource.
5- there is 6 examples:
Inondation (During, optionsFromCapabilities)
Embâcle (During, Interval from Now, Step: P1D)
Embâcle (During, Step: P1Y)
Embâcle (During, Step: P1M)
Embâcle (During, Step: PT4H)
Embâcle (During, Step: P2D)

[matrottier]

OgcFilterDuringOptions : restrictToStep ?: boolean;
if true, only one date can be selected and the period is: selected date + 1x step.

[pelord]

OgcFilterDuringOptions : restrictToStep ?: boolean;
if true, only one date can be selected and the period is: selected date + 1x step.

And why + 1x step?

[matrottier]

OgcFilterDuringOptions : restrictToStep ?: boolean;
if true, only one date can be selected and the period is: selected date + 1x step.

And why + 1x step?

to automatically calculate the end time.
did you want to send only one date ? ex: '2020-08-08 00:00:00'