Add example of "current action ipfs cid" with SIWS and custom condition logic

[glitch003]

This adds an example that uses SIWS to auth a user, with any custom JS logic in the lit action. We use a single access control condition that simply checks that :currentIpfsCid == generatedIpfsCid. Therefore, you're trusting the logic of the Lit Action itself to check whatever conditions you want.

In this example, we just set this additional check to "true", but a dev would implement their own checks here. Therefore, this example gets the dev to a spot where everything works, they have an authed solana wallet address, and they can just write the extra JS they need to check anything they want using the solana wallet. They can check balances, run contract calls, hit things with fetch() or use solana RPC.

I created this for Beacon to help them get their custom solana access control conditions working.