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Add dataProvider mixin (#725)

* Add dataProvider mixin

* Add a test suite for dataProvider mixin

* fix(tests): dataProvider spy callback error

* chore: dataProvider mixin alignment

* fix(dataProvider): request first page when opened

* chore(tests): use named functions for better assertions

* fix(tests): wrong assertions for dataProvider arguments

* fix(tests): wrong assertions for filteredItems from dataProvider

* fix(dataProvider): remove initial dummy filtered item

* fix(dataProvider): ensure first page load when opened

* fix(tests): use opened comboBox in tests for lazy loading

* fix(dataProvider) set loading state while loading

* fix(dataProvider) throw if used with items

* fix(comboBoxLight): add dataProviderMixin

* fix(demos): use preserve-content in lazy loading demo template

* fix(tests): test single first load with size and async cases

* fix(lazyLoading): prevent unnecessary page requests when loading

* fix(tests): add tests for second/third page requests

* fix(filtering): fix excessive loading requests and re-enable builtin items filtering

* fix(dataProvider): prevent duplicate first page requests on certain cases

* fix(tests): relax lazyLoading requested number of pages criteria

* fix(tests): skip hiding while loading test for now

* fix(dataProvider): linter errors

* fix(lazyLoading) cleanup magic placeholder object

* fix(dataProvider): don’t stop requesting pages if already loading

* chore: use 2018 year for new files

* fix(demos): replace arrow function with regular one in lazy loading demo

* chore: cleanup style added by accident in demo index page

* fix: add JSdoc annotations when using ComboBoxDataProviderMixin

* fix(dataProvider): data provider API cleanup

* chore(dataProvider): use single quotes

* fix(dataProvider): throw when incorrect pageSize is set

* fix: use a separate dropdown-wrapper method for dispatching item requests

* fix(la... (continued)

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