PolykeyAgent and PolykeyClient now accept the rpcMiddlewareFactory for Custom Middleware + versionMetadata option for defining version information for agentStatus RPC call

[amydevs]

Description

This PR aims to allow for users of PolykeyAgent and PolykeyClient to insert additional middleware onto the Client RPC service. The main goal, is to be able to have the agentStatus RPC handler be able to report additional information about the Polykey-CLI binary that is running the node, such as the commitHash of the source used to produce binary.

The implementation is based on the middlewareFactory chaining originally found in https://github.com/MatrixAI/Polykey/blob/004ee0827b685622af860395879a53c5c9214014/src/client/utils/middleware.ts;

The versionMetadata field has also been added to the agentStatus RPC call so that the user can provide arbitrary information about the version through the PolykeyAgent constructor parameters.

Issues Fixed

• Related Testnet & Mainnet Status Page testnet.polykey.com mainnet.polykey.com #599 (comment)

Tasks

• 1. Parameterize rpcMiddlewareFactory
• 2. Modify client/middleware.ts to accept custom middleware factories
• 3. Add versionMetadata field to agentStatus RPC handler.

Final checklist

• Domain specific tests
• Full tests
• Updated inline-comment documentation
• Lint fixed
• Squash and rebased
• Sanity check the final build

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