Implement a function has_trivial_storage in BaseRuntime.

[MathieuDutSik]

Motivation

For the purpose of testing if a contract exists in EVM, we introduce the functionality of testing if a contract
has non-trivial storage.

Proposal

The following is done:

• The functionality is added to the BaseRuntime.
• It uses the HasNonTrivialStorage in the execution_state_actor.rs.
• It uses the view.total_size() of the KeyValueStoreView.
• The functionality is provided to the Wasm smart contracts.

Test Plan

The CI.
For testing the has_non_trivial_storage, we implemented separately some end-to-end tests.
They have not been put in the PR, since you need two contracts:

• one that gets instantiated
• and one that does the has_non_trivial_storage.

Release Plan

This does not appear to be TestNet breaking.

Links

None.