Fix #11721 Add support for line traces classification

[subashtiwari1010]

Description

This PR adds the classification mode for the line chart so that the line traces can be categorized for the visualization.

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)

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

• Feature

Issue

What is the current behavior?

Currently, the line trace only supports line, line+marker, and scatter type charts.
#11721

What is the new behavior?

The line traces type will have classification style in dropdown and after it is selected the line traces will be categorized according to the classification attribute field selected.

Breaking change

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

• Yes, and I documented them in migration notes
• No

Other useful information

[allyoucanmap]

There is an error by following these steps:

• open a new dashboard
• create a new chart with mapstore:states layer on gs-stable
• select Line Chart trace
• select state_name as X Attribute
• select land_km as Y Attribute
• select AVG as Operation
• select Classification style
• select sub_region as Classification Attribute
• now switch the chart trace to Bar Chart
• switch again the trace to Line Chart
• select Classification style

Expected:

• chart builder is visible wit the correct preview

Current:

• error in console and grey page

Note: this seems to happen with the specific mapstore:states layer

[allyoucanmap]

why do we need DEFAULT_CLASSIFICATION? Are we doing a similar thing in bar chart?

[allyoucanmap]

From UI I think we should split the mode from msMode property and have two select. This means we should have:

• msMode property select with two options (label Mode):
  • Simple style
  • Classification style
• mode property select with three options (label Type):
  • Line with markers
  • Line
  • Scatter

Note: when we switch from Simple to Classification style we may need to manage the Line with markers options because it needs two different colors one for line and one for markers. I think we could hide Line with markers when classification style is selected.

In this way we will be able to use the scatter chart in classification mode

[allyoucanmap]

@ElenaGallo please test this enhancement on dev, thanks

[ElenaGallo]

@allyoucanmap here are some notes from my test:

1_ Once the line chart widget is added to the dashboard, it is not possible to select individual items in the legend and view them on the chart.
Use this dah sample: https://dev-mapstore.geosolutionsgroup.com/mapstore/#/dashboard/63584

Expected Behavior
(same behavior as the bar chart)

2_chart.mp4

Current Behavior

1_chart.mp4

2_ When switching from a bar chart to a line chart, the classification style option causes an error.

3_chart.mp4