erdjs version mismatches

[andreibancioiu]

Originally reported here.

Steps to reproduce:

• in a snippets project, reference erdjs-snippets (which references a specific version of erdjs, say A)
• in the same snippets project, reference a newer version of erdjs, B)

A series of compilation errors occur.

Solution:

• decoupling, usage of interfaces

Workaround:

• in the snippets project, reference an erdjs version that matches the one listed as a dependency at https://github.com/ElrondNetwork/erdjs-snippets/blob/v{your version of erdjs-snippets}/package.json

Further references:

• https://github.com/microsoft/TypeScript/issues/26559#issuecomment-414808070
• https://stackoverflow.com/a/65791487/1475331

[andreibancioiu]

Related: https://github.com/ElrondNetwork/elrond-sdk-erdjs/pull/209

[andreibancioiu]

Related: https://github.com/ElrondNetwork/erdjs-snippets/pull/10