[IMP] pivots: add "Show value as" to measures

[hokolomopo]

Description:

[IMP] tests: add additional jest matchers

This commit adds the expect().toHaveValue() and expect().toHaveText() custom jest matchers, inspired from Hoot.

[IMP] pivots: add "Show value as" to measures

This commits adds the "Show value as" feature to measures. This allow users to display the value of a measure in a different way, like percentage of column total, percentage of row total, etc.

Task: 4045799

review checklist

• [ ] feature is organized in plugin, or UI components
• [ ] support of duplicate sheet (deep copy)
• [ ] in model/core: ranges are Range object, and can be adapted (adaptRanges)
• [ ] in model/UI: ranges are strings (to show the user)
• [ ] undo-able commands (uses this.history.update)
• [ ] multiuser-able commands (has inverse commands and transformations where needed)
• [ ] new/updated/removed commands are documented
• [ ] exportable in excel
• [ ] translations (_t("qmsdf %s", abc))
• [ ] unit tested
• [ ] clean commented code
• [ ] track breaking changes
• [ ] doc is rebuild (npm run doc)
• [ ] status is correct in Odoo