Add EIP: On-chain upgrade signaling

[fulldecent]

Ready for draft, please

[eth-bot]

File EIPS/eip-7848.md

Requires 1 more reviewers from @g11tech, @lightclient, @SamWilsn

[github-actions]

The commit 6ff93a5 (as a parent of fb9bdfb) contains errors.
Please inspect the Run Summary for details.

[g11tech]

not sure if this proposal is relevant to eth cc @SamWilsn as we may never go down this path

[fulldecent]

Relevance should be based on whether this is an implementable proposal and if I can be heard.

Hopefully it is and this can be merged as DRAFT.

And then LATER, a stricter test is whether to implement this.

[abcoathup]

Suggested change

	title: On-chain upgrade signaling
	title: Onchain upgrade signaling

I am not an editor. My personal preference is onchain.

[fulldecent]

Well noted.

At this point, on-chain is the preferred usage across other publications in this repo.

I'm happy to adopt the less common usage if we can point to it as a best practice.

And either way that should be after merging this as draft.

[fulldecent]

@g11tech requesting a merge for PR please so this can be discussed as draft