Add a new project for DataStore

[ralstondasilva]

The data store details on DAC has inline code snippets https://developer.android.com/topic/libraries/architecture/datastore

This PR adds code samples that can be used as snippets on DAC.
It provides samples to create 3 different kinds of data store implementations:

1. Preferences Data Store
2. Proto Data Store
3. Json Data Store

It also provides an example that demonstrates how to create a data store that can be accessed from multiple processes.

[snippet-bot]

Here is the summary of changes.

You are about to add 34 region tags.

• datastore/build.gradle.kts:6, tag android_datastore_proto_plugin
• datastore/build.gradle.kts:10, tag android_datastore_serialization_plugin
• datastore/build.gradle.kts:60, tag android_datastore_dependency
• datastore/build.gradle.kts:68, tag android_datastore_preferences_dependency
• datastore/build.gradle.kts:76, tag android_datastore_preferences_dependency_rxjava
• datastore/build.gradle.kts:87, tag android_datastore_proto_dependency
• datastore/build.gradle.kts:91, tag android_datastore_json_dependency
• datastore/build.gradle.kts:104, tag android_datastore_proto_task
• datastore/src/main/AndroidManifest.xml:26, tag android_datastore_multiprocess_manifest
• datastore/src/main/java/com/example/datastore/snippets/TimestampUpdateService.kt:30, tag android_datastore_multiprocess_service
• datastore/src/main/java/com/example/datastore/snippets/json/JsonDataStore.kt:32, tag android_datastore_json_create
• datastore/src/main/java/com/example/datastore/snippets/json/JsonDataStore.kt:41, tag android_datastore_json_read
• datastore/src/main/java/com/example/datastore/snippets/json/JsonDataStore.kt:47, tag android_datastore_json_write
• datastore/src/main/java/com/example/datastore/snippets/json/JsonDataStore.kt:56, tag android_datastore_json_definition
• datastore/src/main/java/com/example/datastore/snippets/json/JsonDataStore.kt:63, tag android_datastore_json_serializer
• datastore/src/main/java/com/example/datastore/snippets/json/JsonDataStoreScreen.kt:42, tag android_datastore_json_compose_sample
• datastore/src/main/java/com/example/datastore/snippets/multiprocess/MultiProcessDataStore.kt:34, tag android_datastore_multiprocess_create
• datastore/src/main/java/com/example/datastore/snippets/multiprocess/MultiProcessDataStore.kt:50, tag android_datastore_multiprocess_read
• datastore/src/main/java/com/example/datastore/snippets/multiprocess/MultiProcessDataStore.kt:56, tag android_datastore_multiprocess_write
• datastore/src/main/java/com/example/datastore/snippets/multiprocess/MultiProcessDataStore.kt:69, tag android_datastore_multiprocess_definition
• datastore/src/main/java/com/example/datastore/snippets/multiprocess/MultiProcessDataStore.kt:76, tag android_datastore_multiprocess_serializer
• datastore/src/main/java/com/example/datastore/snippets/multiprocess/MultiProcessDataStoreScreen.kt:44, tag android_datastore_multiprocess_app
• datastore/src/main/java/com/example/datastore/snippets/preferences/PreferencesDataStore.kt:28, tag android_datastore_preferences_create
• datastore/src/main/java/com/example/datastore/snippets/preferences/PreferencesDataStore.kt:35, tag android_datastore_preferences_read
• datastore/src/main/java/com/example/datastore/snippets/preferences/PreferencesDataStore.kt:41, tag android_datastore_preferences_write
• datastore/src/main/java/com/example/datastore/snippets/preferences/PreferencesDataStore.kt:54, tag android_datastore_preferences_write_edit
• datastore/src/main/java/com/example/datastore/snippets/preferences/PreferencesDataStore.kt:63, tag android_datastore_preferences_key
• datastore/src/main/java/com/example/datastore/snippets/preferences/PreferencesDataStoreScreen.kt:44, tag android_datastore_preferences_compose_sample
• datastore/src/main/java/com/example/datastore/snippets/proto/ProtoDataStore.kt:30, tag android_datastore_proto_create
• datastore/src/main/java/com/example/datastore/snippets/proto/ProtoDataStore.kt:39, tag android_datastore_proto_read
• datastore/src/main/java/com/example/datastore/snippets/proto/ProtoDataStore.kt:45, tag android_datastore_proto_write
• datastore/src/main/java/com/example/datastore/snippets/proto/ProtoDataStore.kt:54, tag android_datastore_proto_serializer
• datastore/src/main/java/com/example/datastore/snippets/proto/ProtoDataStoreScreen.kt:42, tag android_datastore_proto_compose_sample
• datastore/src/main/proto/settings.proto:1, tag android_datastore_proto_definition

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[riggaroo]

mostly lgtm, just some questions

[ralstondasilva]

Rebecca, can you take another look at this? This is my first GitHub PR so I didn't realize that I needed to send a separate commit (I amended my commit like we do in Gerrit) So some of the comments don't match the previous line numbers. Sorry!