feat: Add Sei Plugin

[mj850]

Relates to

Adding a dedicated Sei plugin that streamlines the development experience for creating agents that can interact on the Sei Network.

Risks

Low. This is an external plugin and does not affect the agent's basic capabilities.

Background

What does this PR do?

This PR introduces a Sei Plugin that allows ELIZA agents to interact with the Sei Network.

It initially supports the Transfer feature, allowing users to send funds to each other on the Sei blockchain.

What kind of change is this?

Feature

Documentation changes needed?

README.md has been added documenting the sei plugin.

Testing

Added unit tests to test basic functionality of the plugin.
Also performed manual tests against the stock agent in the client - agent was able to successfully query it's own SEI Balance, as well as perform transfers to both 0x and SEI addresses.

Where should a reviewer start?

• Review the main plugin entry point: src/index.ts

• Examine the provider and actions added to the plugin - these are adapted and simplified versions of the EVM plugin.

• Check the error handling for all the new methods to ensure that the agent handles errors gracefully and that issues are surfaced to the user.

Detailed testing steps

Pull this branch and create a new .env from the updated .env.example file.
Be sure to update the SEI_PRIVATE_KEY and set SEI_NETWORK to 'devnet'
Run the usual setup steps:

• pnpm install
• pnpm build
• pnpm cleanstart --characters="characters/<character file here>"
  On a different terminal
• pnpm start:client

Then, ask the agent to query its balances and send transfers to any address.

Deploy Notes

Database changes

Deployment instructions

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[github-actions]

Hi @mj850! Welcome to the elizaOS community. Thanks for submitting your first pull request; your efforts are helping us accelerate towards AGI. We'll review it shortly. You are now an elizaOS contributor!