fix(api-sdk): fix get groups function

[vplasencia]

Description

This PR:

• Fixes the getGroups() function in the API SDK.
  • A try catch was added to add null to the credentials that are not a valid JSON string.
• Updates the group credentials type in the API docs from object to string.
• Updates the default value for a credential group from {} to '{"id":"BLOCKCHAIN_BALANCE","criteria":{"minBalance":"10","network":"Sepolia"}}'.
• Improves developer experience when creating a credential groups programmatically.
• Adds support for multiple credentials groups.
• Adds a new script to run tests for a specific library: yarn test:library <package-name>.

Related Issue

Closes #561

Does this introduce a breaking change?

• Yes
• No

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