feat(governance): add delegateVotingPower, getPushTokenAddress, getPushBalance, getVotingPower, and getDelegatedTo functions

[wolfcito]

Relates to:

Background

What does this PR do?

This PR introduces several new functionalities for the Push Chain governance system, which include:

1. delegateVotingPower: Allows users to delegate their voting power to a specified address.
2. getPushTokenAddress: Retrieves the address of the PUSH token on various chains.
3. getPushBalance: Fetches the $PUSH token balance of an address.
4. getVotingPower: Retrieves the current voting power of an address.
5. getDelegatedTo: Returns the address to which the user's voting power is delegated.

These functions interact with the Push governance contract, providing essential features for managing governance-related actions.

Testing

1. Import the PushGovernanceService class into the testing environment.
2. Set up the valid wallet address with sepolia funds
3. Test each function by calling them with appropriate parameters and ensuring the expected outputs are returned.

Detailed testing results

Method	Prompt	Screenshot	Transaction Link
get_push_balance	hat is my balance in $PUSH?		N/A
get_voting_power	What is my voting power?		N/A
get_delegated_to	To which address have I delegated my voting power?		N/A
delegate_voting_power	delegate my voting power to myself		txn

Docs

My changes do not require a change to the project documentation.

Checklist

• I have tested this change and added the relevant screenshots to the PR description
• I updated the README if necessary to include the new plugin, wallet, chain, etc.

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Latest commit: 5633c47

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