Node API authorization

[kostysh]

In this PR:

• Added UsersDb class which implements users management API
• Added NodeApiServer class which implements a tRPC-based API for the protocol Node
• Added tests for the UsersDb
• Added tests for the NodeApiServer (routes for a user and admin)

Authorization endpoints:

• admin.register: Can be called by the Node owner only (using EIP-712 signature);
• admin.login: Can be called by the Node owner only (using EIP-712 signature); If succeeded, returns an access token in the ACCESS_TOKEN HTTP header;
• user.register: Can be called by admin only. Accepts login and password;
• user.login: Log in the user; If succeeded, returns an access token in the ACCESS_TOKEN HTTP header;
• user.logout: Can be called by an authorized user only; Log out the user;
• user.delete: Can be called by an authorized user only (in upcoming updates this will be allowed to an admin also); Deletes the user;

All requests that require authorization must include an access token in the authorization (Bearer <access_token>) header format

[github-actions]

🎉 This PR is included in version 0.1.0-beta.18 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

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