feat(platform): add datasource loading events

[dmitry-stepanenko]

Related Issue(s)

closes #7581

Description

Updated all pre-defined dataSources by adding onDataRequested(), onDataReceived() and isDataLoading methods/props.

These methods are now exposed as outputs by platform components, that use DataSource:

• approval flow
• combobox
• multi-combobox
• multi-input
• table
• value-help-dialog
• upload-collection

Additionally, complex components as table, upload collection, value help dialog and approval flow are now able to display loading state without a need to be managed externally (by relying on the methods from dataSource directly)

Screenshots

Before:

After:

Please check whether the PR fulfills the following requirements

During Implementation

1. Visual Testing:

• visual misalignments/updates
• check Light/Dark/HCB/HCW themes
• RTL/LTR - proper rendering and labeling
• responsiveness(resize)
• Content Density (Cozy/Compact/(Condensed))
• States - hover/disabled/focused/active/on click/selected/selected hover/press state
• Interaction/Animation - open/close, expand/collapse, add/remove, check/uncheck
• Mouse vs. Keyboard support
• Text Truncation

2. API and functional correctness

• check for console logs (warnings, errors)
• API boundary values
• [n/a] different combinations of components - free style
• change the API values during testing

3. Documentation and Example validations

• missing API documentation or it is not understandable
• poor examples
• Stackblitz works for all examples

4. Accessibility testing
5. Browser Testing - Edge, Safari, Chrome, Firefox

PR Quality

• the commit message(s) follows the guideline:
  https://github.com/SAP/fundamental-ngx/blob/main/CONTRIBUTING.md
• [n/a] tests for the changes that have been done
• all items on the PR Review Checklist are addressed :
  https://github.com/SAP/fundamental-ngx/wiki/PR-Review-Checklist
• [n/a] Run npm run build-pack-library and test in external application
• [n/a] update README.md
• [n/a] Breaking Changes Wiki

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[github-actions]

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