Add suport for latest ink! metadata

[statictype]

Adds latest ink! metadata updates to the Abi interface and type definitions.
Related to use-ink/contracts-ui#469

Changes:

• contract environment types
• "default" property on messages and constructors
• return type for constructors

Contract with modified environment
custom_env.json.zip

[jacogr]

We seem to have version specific logic which is unsatainable the more there are. While we always convert from Vx -> V as part of the logic - this allows us to always deal with only the latest, without specific existence checks.

[statictype]

@jacogr I removed all unnecessary checks and decoded environment types.
decoding is weird because the environment can contain both types and values so some checks are needed.
For example maxEventTopics is a value and the rest are types.
https://github.com/paritytech/ink/blob/8bb4b40d76adb28cf046f385cb5842bcd90b8787/crates/env/src/types.rs#L125

Btw, is this ok for usize?

I added ink! v4.2.0 contracts for testing and the tests still fail, not sure why.

[jacogr]

usize should never be used. It acts differently on WASM vs native - i.e. it has a different size based on the execution environment. Using it will end up with consensus failures.

Stale review.

[jacogr]

Thank you.

[polkadot-js-bot]

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