Implement a lib for contact-exchange with multipe identities

[Ogenbertrand]

I implemented a library for handling contact exchanges between wallets, focusing on Out-Of-Band (OOB) invitations within the DIDComm messaging framework. The library allows wallets to process OOB invitations and manage contacts across multiple identities.

Key Features

• OOB Invitation Processing: The library includes a function to parse and process DIDComm OOB invitations, extracting relevant details like service endpoints and recipient keys.
• Wallet and Contact Management: A Wallet class is implemented to manage contacts for multiple identities, supporting the addition, retrieval, and cross-identity access to contacts.
• Test Coverage: Comprehensive unit tests have been added for OOB invitation processing and wallet functionalities using Jest.

This implementation aligns with the DIDComm specifications and OOB messaging. It is designed to handle a key requirement of enabling communication between wallets via contact exchange.

Closes https://github.com/adorsys/eudiw-app/issues/220

[hugoib]

Please revisit the naming conventions of your files for more standardisation. The rest of the libraries use all the same PascalCase naming.

[hugoib]

The flow in general looks good!

what I would add, for completion is a parser.

The oob as a url format with a b64 encoded part:

https://identity.foundation/didcomm-messaging/spec/#standard-message-encoding

The rest, looks good! Thanks.

[hugoib]

Take a look at this notebook to understand better didcomm and further reference:

https://github.com/adorsys/eudiw-app/issues/220#issuecomment-2402368935

[Ogenbertrand]

Take a look at this notebook to understand better didcomm and further reference:

adorsys/eudiw-app#220 (comment)

Okay @hugoib,
Thank you.