* refactor: 💡 rename folder to "explore_data"
* style: 💄 check for "share" plugin in more semantic way
"explore data" actions use Discover URL generator, which is registered
in "share" plugin, which is optional plugin, so we check for its
existance, because otherwise URL generator is not available.
* refactor: 💡 move KibanaURL to a separate file
* feat: 🎸 add "Explore underlying data" in-chart action
* fix: 🐛 fix imports after refactor
* feat: 🎸 add start.filtersFromContext to embeddable plugin
* feat: 🎸 add type checkers to data plugin
* feat: 🎸 better handle empty filters in Discover URL generator
* feat: 🎸 implement .getUrl() method of explore data in-chart act
* feat: 🎸 add embeddable.filtersAndTimeRangeFromContext()
* feat: 🎸 improve getUrl() method of explore data action
* test: 💍 update test mock
* fix possible stale hashHistory.location in discover
* style: 💄 ensureHashHistoryLocation -> syncHistoryLocations
* docs: ✏️ update autogenerated docs
* test: 💍 add in-chart "Explore underlying data" unit tests
* test: 💍 add in-chart "Explore underlying data" functional tests
* test: 💍 clean-up custom time range after panel action tests
* chore: 🤖 fix embeddable plugin mocks
* chore: 🤖 fix another mock
* test: 💍 add support for new action to pie chart service
Co-authored-by: Anton Dosov <anton.dosov@elastic.co>
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