Introduce the test-X for the storages.

[MathieuDutSik]

Motivation

It is preferable to separate the storage support from their usage.

Proposal

The change being done are:

• The test-storage-service, test-rocksdb, test-dynamodb, test-scylladb and test-indexeddb are introduced.
• The selection of test-X automatically implies the selection of X in the Cargo.toml.
• The CI is updated accordingly.
• The with_test_dynamodb are added to the build.rs when existing.

Test Plan

The changes do not change the tests.

Release Plan

Not relevant.

Links

• reviewer checklist

[ma2bd]

This may not be as urgent or useful because linera net up tries to call linera-storage-server even when the feature storage-service is not selected. Therefore, we don't need to make this feature a default. (In a way, storage-service is already acting as test-storage-service ?)

[MathieuDutSik]

We need some more planned changes to the tests and this approach was deemed inadequate.