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Add datasource for Safe Decoder Service (#2313)

The new [Safe Decoder Service](https://safe-decoder.safe.global/docs) improves upon the decoder of the Safe Transaction Service. As such, we intend to migrate to it.

This lays the foundation of usage, by creating a datasource (with manager) and base repository for validating the responses:

- Add `safeDataDecoder.baseUri` (test) configuration
- Add `DataDecoderApiManager` interface, implementation and module
- Add `DataDecoderApi` interface, implementation and module
- Add validation schemas for `DataDecoded` and `Contract, with inferred types and builders
- Add base `DataDecoderRepository` for accessing/validating datasource responses
- Add appropriate test coverage of service and schemas

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