feat: add property to control multi-sort priority

[web-padawan]

Description

Added multiSortPriority property that can be used to update sorting behavior as follows:

1. Clicking a sorter for a not yet sorted column "appends" it by applying at the end of the existing sorters,
2. Clicking a sorter for an already column sorted does not update order in which columns are sorted.

Fixes #1281

Part of vaadin/platform#3052
Related to vaadin/flow-components#1197

Type of change

• Feature

Checklist

• I have read the contribution guide: https://vaadin.com/docs-beta/latest/guide/contributing/overview/
• I have added a description following the guideline.
• The issue is created in the corresponding repository and I have referenced it.
• I have added tests to ensure my change is effective and works as intended.
• New and existing tests are passing locally with my change.
• I have performed self-review and corrected misspellings.

Additional for Feature type of change

• Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
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0.0% Duplication