RT-1384 (charts-on-fhir) Customize tooltip title

[vdeshkar]

Overview

When creating a custom mapper, we can customize the tooltip title to use something other than the y-value for category scales.

How it was tested

I ran the showcase app and checked the graphs by adding a tooltipTitle in its mappers.

Checklist

• The title contains a short meaningful summary
• I have added a link to this PR in the Jira issue
• I have described how this was tested
• I have included screen shots for changes that affect the user interface
• I have updated unit tests
• I have run unit tests locally
• I have updated documentation (including README)
  

[yashpmohod]

hi @vdeshkar one thing from my side, do we need a minor version release for this?

[vdeshkar]

hi @vdeshkar one thing from my side, do we need a minor version release for this?

Yes @yashpmohod, I'll update the version

[semicolin]

Since we have 2 approved PRs we could release them both in the same version (4.0). If they both change the version number we need to resolve the conflict.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud