release: 0.7.0

[Wondertan]

Meta issue for the upcoming 0.7.0 release. Besides attached sub-issues the release includes following PRs:

• chore: bump deps #255
• params(store): Change default cache size for StoreCache + WriteBatch #252
• chore: major linting #256
• perf(p2p): avoid deserialization for locally published headers #251
• feat(sync): non-recursive singleflight protection for Head #229

Nice-to-haves:

• refactor(store): synchronize Store writes #241