Airdrop if needed initialized a new KP

[jim4067]

When initializing a new wallet, try to airdrop devnet sol to it.

[acheroncrypto]

This is actually implemented but was disabled in 5f3ab9b because of the extremely restrictive rate limits for devnet. What's worse is if you get rate limited simply because you've asked for an airdrop, you also get rate limited for all the other methods which makes the RPC endpoint unusable for quite a while.

Not exactly sure what's the solution going to be for this problem, do you have anything in mind?

[jim4067]

1. We could only enable the airdrop for new wallets. e.g when Keypair.generate() is run.

2. Since the rate limit for the airdrop is 4 sol/day, we could use local storage or indexedDB to keep track of this and not call the airdrop function if the limit is reached.