[SDK v3] - Unify `core` and `network` in a single library to release

[lucanicoladebiasi]

Summary

It doesn't exist a use case where core is used without network (nor logs or errors hence those once separated library should be unified in a single artefact library.

Basic Example

See summary.

[claytonneal]

the package will be called "@vechain/sdk-thor"
we can then do "@vechain/sdk-ethereum"
wdyt?

[victhorbi]

@lucanicoladebiasi
can you merge your changes first?