Simplify skeleton requests, limit bor spanCache, more fine grained locking in HeaderDownload (#4194)

* Simplify skeleton requests

* Limit bor cache size

* In the middle of changing lists

* Fix

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>
Co-authored-by: Alex Sharp <alexsharp@Alexs-MacBook-Pro.local>

--nat stun is an automatic external IP detection alternative to manual --nat extip option.
It can be used both at home or on production servers without any extra setup.
It is fast (up to 5 ms) and more reliable than alternatives (as the request goes to the public internet).

This auto-detection is useful to run multiple instances of a service in cloud environments
where the node IPs are not known in advance.

* Reduce insertQueue usage, throttle Skeleton requests

* Cleanup

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* save

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* Changes:
* Proceeded to check if other h, r, t or c flags for 'before' and 'older' are set before returning from the default state of --prune
Concern:
* Does the 'disabled' value for '--prune=' need to be updated if the '--prune.*' flags are set but the '--prune=' flag is not?

* Modify mode.Initialised only when it is changed

* Updated layout for --prune=*

* save

* save

Co-authored-by: alex.sharov <AskAlexSharov@gmail.com>

This reverts commit 46f9411e.

Use matrix.os in cache keys to not share caches between OS versions:
- runner.os = Windows
- matrix.os = windows-2022

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

The test fails sometimes on macOS CI with:
v5_udp_test.go:477: unexpected error: "RPC timeout"

Fixing by increasing the timeout from 120ms to 700ms,
and move the test to the integration suite, because it takes up to 1s now.

https://github.com/golangci/golangci-lint/issues/2649

WARN [linters context] bodyclose is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] gosimple is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] staticcheck is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] structcheck is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] unused is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.

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* Fix interaction with beacon node

* Fix logging

* Fix logging and add comments

* Fix logging

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* Export chainspecs into json files

* Add sepolia

* Add more chains

* Extract rest of the chains

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

Co-authored-by: Alex Sharp <alexsharp@Alexs-MacBook-Pro.local>

* added check method to hd

* goroutine to check if we have headers

* added initial cycle to Ethereum object

* stage loop will only run ones

* got rid of anchor print

* header stage skip cycle message

* increased original time by a 2 seconds

* for inside of stageloop

* simplified

* little fixes

* got rid of skipCycle

* simplified

* hmm

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* Restore skip analysis optimisation

* Make checkChangeSets work with snapshots

* Add syncmode to checkChangeSets

* Add block number for BSC

* Fix lint

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>