Data source improvements

[jpzwarte]

• Moved DataSource and ArrayDataSource into its own @sl-design-system/data-source package
• Added FetchDataSource to the data source package
• Removed the filteredItems property of DataSource (just use the items property instead)
• Fixed ArrayDataSource to handle multiple filters for the same path using OR instead of AND
• Changed GridColumn to render an <sl-skeleton> for items that equal FetchDataSourcePlaceholder

Fixes #140

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🦋 Changeset detected

Latest commit: ffbb1aa

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 29 packages

Name	Type
@sl-design-system/data-source	Patch
@sl-design-system/shared	Minor
@sl-design-system/grid	Minor
@sl-design-system/accordion	Patch
@sl-design-system/avatar	Patch
@sl-design-system/button	Patch
@sl-design-system/checkbox	Patch
@sl-design-system/dialog	Patch
@sl-design-system/editor	Patch
@sl-design-system/emoji	Patch
@sl-design-system/form	Patch
@sl-design-system/format-date	Patch
@sl-design-system/inline-message	Patch
@sl-design-system/menu	Patch
@sl-design-system/panel	Patch
@sl-design-system/popover	Patch
@sl-design-system/radio-group	Patch
@sl-design-system/search-field	Patch
@sl-design-system/select	Patch
@sl-design-system/switch	Patch
@sl-design-system/tabs	Patch
@sl-design-system/tag	Patch
@sl-design-system/text-area	Patch
@sl-design-system/text-field	Patch
@sl-design-system/toggle-button	Patch
@sl-design-system/toggle-group	Patch
@sl-design-system/tooltip	Patch
@sl-design-system/combobox	Patch
@sl-design-system/tool-bar	Patch

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