Delegation balance

[sanjay-del]

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Testing

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Additional Information

This PR closes the issue #35 (Stake account delegation history) and completes one task from issue #34 (Balance by payment credential endpoint)

[sanjay-del]

@Vardominator

[Vardominator]

@sanjay-del Looks good. Can you please bump the version in package.json to 1.5.4 before we merge?

[sanjay-del]

@Vardominator updated package json version

[Vardominator]

@sanjay-del https://github.com/maestro-org/typescript-sdk/releases/tag/v1.5.4