Refactor packages and other minor improvements

[Xearty]

• [a961c80b] fix(relay): Fix getCurrentSSZ slot bug and rename
• [1d905cb4] build(yarn): Upgrade @lodestar/types and @lodestar/config
• [0b541729] refactor(yarn): Create and install @dendreth/utils workspace and use absolute paths in imports
• [805e6acd] build(yarn): Refactor chainsafe dependencies
• [6d38bcaf] refactor(yargs): Update usage of yargs
• [5a56ffea] refactor(redis-work-queue): Update usage of @mevitae/redis-work-queue and use esm imports
• [fc4503a8] refactor(yarn): Create and install @dendreth/relay workspace and use absolute paths in imports
• [ed341a64] refactor(yarn): Create and install @dendreth/solidity workspace and use absolute paths in imports
• [ddfc14de] refactor(yarn): Create and install @dendreth/plonky2 workspace and use absolute paths in imports
• [d1770973] refactor(yarn): Reorder dependencies
• [8a563788] fix(beacon-api): Handle status 404 when fetching beacon state
• [f64cad0c] feat(yarn scripts): Add check:build script
• [c748a9a3] feat(CI): Run build step in the CI