- Move our own code to `_ext.go` files
- Import symbols from libevm in imports.go

See original PR ava-labs/coreth#772

Co-authored-by: Arran Schlosberg <[email protected]>

See original PR ava-labs/coreth#832

See original PR ava-labs/coreth#851

See original PR ava-labs/coreth#855

- fix generation of code using type aliases and Go 1.23
- reproducible generation locally (pin gencodec version)
- CI keeps generated Go files up to date with other source code
- Generate missing files

See original PR ava-labs/coreth#856

See original PR ava-labs/coreth#850

Co-authored-by: Arran Schlosberg <[email protected]>

See original PR ava-labs/coreth#871

Reduces overlap between subnet-evm and upstream files:
- Types and variables that are identical to `libevm` are moved to `imports.go`.
- Files that include only `subnet-evm` have the `_ext.go` suffix added.

See original PR ava-labs/coreth#872

These packages are unused and were just copies from the `ava-labs/libevm` repo.

See original PR ava-labs/coreth#876

Until a complete transition to a `libevm` package, it shouldn't be allowed to be imported directly.

Remove the package from the allowed list and move a `types` test into `package types_test` to avoid a circular dependency.

See original PR ava-labs/coreth#874

Complete the transition of `core/types` to upstream code.

Note that the previous commit results in _all_ upstream types / vars / consts being in the `imports.go` file. This results in a strict partition of upstream and local identifiers so it is safe to simply change import paths.

1. Globally change all imports from `subnet-evm/core/types` to `libevm/core/types`;
2. Rename all `subnet-evm/core/types` imports to `customtypes` for ease of review here;
3. Dot import `libevm/core/types` in tests only to avoid hundreds of noisy changes.

See original PR ava-labs/coreth#875

The `types` package now only contains `coreth` logic an nothing from upstream so it shouldn't live in the same location in the repo.

Automated:

```shell
$ git mv core/types plugin/evm/types
$ find -name '*.go' | xargs sed -i 's|"github.com/ava-labs/coreth/core/types"|"github.com/ava-labs/coreth/plugin/evm/types"|'
$ golangci-lint run --fix
```

See original PR ava-labs/coreth#877

See original PR ava-labs/coreth#888

- import interfaces from github.com/ava-labs/libevm directly
- import `NotFound` error from github.com/ava-labs/libevm directly
- Keep our two subnet-evm-specific interfaces at interfaces/interfaces.go

See original PR ava-labs/coreth#883

See original PR ava-labs/coreth#890

Changes applied from comments on the review of ava-labs/coreth#820

See original PR ava-labs/coreth#862

Signed-off-by: Quentin McGaw <[email protected]>
Co-authored-by: Arran Schlosberg <[email protected]>