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Validate `RelayDto` using `zod` (#1203)

This migrates the validation of `RelayDto` as an initial stage of replacing `ajv` with `zod:

- `to`, the string is checked for validity (is an Ethereum address) and coerced to be checksummed.
- `data`, the string is checked for validity (is hexadecimal).
- `version`, the string is checked for validity (is SemVer).
- `gasLimit`, the string is checked for validity (either `undefined` or a numerical string) and coerced to `null` or `BigInt`.

Using the `RelayDtoSchema`, the `RelayDto` types are automatically inferred with the aforementioned coerctions by using `zod`'s `z.infer` utility type.

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