feat: use new history proof types and content value

[morph-dev]

What was wrong?

We have to migrate to new encoding for HeaderWithProof and HistoryContentValue.
See #1666 for more details.

How was it fixed?

Type and db migration is already done in previous PRs.

Important things related to this PR:

• updates the HistoryContentValue type that is re-exported in ethportal-api
  • HeaderWithProof is not re-exported, so we have to change imports
  • old types should no longer be used, except during db migration
• Updates portal-spec-tests submodule to the latest commit (that contains updated test vectors)
• Header validator is updated to use new types
• Some state network tests will not be passing when header validation is re-enabled
  • This is caused by test vectors containing only header, without proof, and should be fixed by adding header proof
  • Affected tests (as fast I could find): state validator and state peer-to-peer

NOTE: The merge and release that contains this PR should be coordinated with other clients

[KolbyML]

looks good

[ogenev]

⛵