Restructure examples directory (#15349)

1. Eliminates the "hosts" directory.
2. Declares "data-objects" to be specifically for webpack-fluid-loader
examples (examples not using webpack-fluid-loader either move to "apps"
or a more specific location). Added a README to indicate this.
3. Sets up several subdirectories for more-specific and meaningful topic
groupings:
    * benchmarks
    * external-data
    * version-migration
    * view-integration
4. Moves examples under /experimental into the /examples directory in
their appropriate location. /experimental/examples is eliminated.
5. Rescopes `@fluid-experimental/inventory-app` to
`@fluid-example/inventory-app`
6. Moves `@fluid-experimental/tree-react-api` to /experimental/framework
7. Fixes up some incorrect `repository.directory` entries in
package.jsons

azure/packages/external-controller/package.json

@@ -7,7 +7,7 @@
 	"repository": {
 		"type": "git",
 		"url": "https://github.com/microsoft/FluidFramework.git",
-		"directory": "examples/hosts/app-integration/external-controller"
+		"directory": "azure/packages/external-controller"
 	},
 	"license": "MIT",
 	"author": "Microsoft and contributors",

examples/apps/presence-tracker/package.json

@@ -7,7 +7,7 @@
 	"repository": {
 		"type": "git",
 		"url": "https://github.com/microsoft/FluidFramework.git",
-		"directory": "examples/data-objects/presence-tracker"
+		"directory": "examples/apps/presence-tracker"
 	},
 	"license": "MIT",
 	"author": "Microsoft and contributors",

examples/apps/task-selection/package.json

@@ -7,7 +7,7 @@
 	"repository": {
 		"type": "git",
 		"url": "https://github.com/microsoft/FluidFramework.git",
-		"directory": "examples/data-objects/task-selection"
+		"directory": "examples/apps/task-selection"
 	},
 	"license": "MIT",
 	"author": "Microsoft and contributors",

examples/benchmarks/bubblebench/baseline/package.json

@@ -7,7 +7,7 @@
 	"repository": {
 		"type": "git",
 		"url": "https://github.com/microsoft/FluidFramework.git",
-		"directory": "experimental/examples/bubblebench/baseline"
+		"directory": "examples/benchmarks/bubblebench/baseline"
 	},
 	"license": "MIT",
 	"author": "Microsoft and contributors",

examples/benchmarks/bubblebench/common/package.json

@@ -7,7 +7,7 @@
 	"repository": {
 		"type": "git",
 		"url": "https://github.com/microsoft/FluidFramework.git",
-		"directory": "experimental/examples/bubblebench/common"
+		"directory": "examples/benchmarks/bubblebench/common"
 	},
 	"license": "MIT",
 	"author": "Microsoft and contributors",

examples/benchmarks/bubblebench/editable-shared-tree/package.json

@@ -7,7 +7,7 @@
 	"repository": {
 		"type": "git",
 		"url": "https://github.com/microsoft/FluidFramework.git",
-		"directory": "experimental/examples/bubblebench/editable-shared-tree"
+		"directory": "examples/benchmarks/bubblebench/editable-shared-tree"
 	},
 	"license": "MIT",
 	"author": "Microsoft and contributors",