chore: [IOBP-644] Add other onboardable method filters

[Hantex9]

Short description

This PR adds a filter on onboardable methods in the add new method section and a filter on methods with guest payment

List of changes proposed in this pull request

• Upgraded the API definitions of e-commerce & walletv3;
• Created a utility function to filter the onboardable methods and guest payment methods;

How to test

• Check out this PR: https://github.com/pagopa/io-dev-api-server/pull/379
• Try the new payment checkout flow and onboarding flow with the feature flag enabled
• You should be able to complete all the required steps with any error;