Clean-up and deduplicate blobs and columns helpers

[matthewkeil]

Describe the bug

There is some overlap and organizational issues with beacon-node/src/util/blobs.ts beacon-node/src/util/dataColumns.ts

Expected behavior

Need to make another pass and clean those up before mainnet release ideally

Steps to reproduce

No response

Additional context

No response

Operating system

Linux

Lodestar version or commit hash

unstable

[pheobeayo]

Can I take up this issue?

[philknows]

This might be a bit difficult for a first time contributor @pheobeayo . Feel free to look at some of our tagged good first issues