Oleg Kovalov

fix(store): stop doing header verification in GetRangeByHeight

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## Overview We don't need to verify headers on every `GetRangeByHeight` 'cause verification already happened in `Append`. No tests failed, added `TestStore_Append_BadHeader` to prevent bugs in the future. Fixes #135

refactor(pruner): reset maxHeadersPerLoop properly

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We were resetting `maxHeadersPerLoop` to a different value (`1024`) which has no relations to the default value (`512`). Which isn't that bad because it's a test but still we have...

Chances that we will get https://github.com/golang/go/issues/36532 is quite low, however this should make our tests a bit simpler.

Updates #3444

## Overview The main idea of this PR is to make `Store[H].Head` working properly, to be precise: returning head that was written to the disk (*). Along with that `heightSub.height`...

## Overview After #211 we can improve `Store[H].flushLoop` a bit more: respect context. Also, added a test to verify that retries works. Lowered max sleep from 1sec, 100msec should be...

## Overview

feat(store): add Tail method

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## Overview Add `.Tail` method to `header.Store[H]` and `store.Store[H]` implementation. For now method tries to return genesis header. In the future PRs method will start returning real tail of the...

Fixes #217