Roll a @solana/sysvars package for working with Sysvars

[buffalojoec]

Motivation

Having a package with helpers used by and re-exported by the main library for working with Sysvars might be quite convenient. It could leverage fetchAccount from @solana/accounts and the types from @solana/rpc-parsed-types to build nice helpers for fetching Sysvars.

Example use case

import { getClock, JsonParsedClockAccount } from `@solana/sysvars`;

const clock: JsonParsedClockAccount = await getClock();

I am not 100% sure how necessary sysvars are from a client perspective, but if there's potential for this to be useful let's do it!

[github-actions]

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