Validate existing header fields once HotShot supports validated state

[jbearer]

• height increases by 1
• timestamp is within some delta of the current time and not decreasing
• L1 head is within some delta of the current L1 head and not decreasing
• L1 finalized is accurate, within some delta of the current L1 head, not in the future, and not decreasing

[tbro]

from zulip:

I think we are missing these checks:

• timestamp is within some delta of the current time
• L1 head is within some delta of the current L1 head
• L1 finalized is accurate, within some delta of the current L1 head, not in the future

I think to properly enforce these we should add some parameters to the chain config:

• max_time_drift
• max_l1_head_drift
• max_l1_finalized_drift

Adding these would be a breaking change, so let's circle back to this after the versioning PR is merged, and we can incorporate these checks into 0.3 along with the marketplace