*: move Notary contract out of P2PSigExtensions under Echidna hardfork #1281

Job	Run time
CodeQL (go)	2m 42s
Check internal dependencies	8s
Check code generated with 'go generate' is up-to-date	15s
Lint	43s
Coverage	6m 43s
Run tests (ubuntu-22.04, 1.20)	7m 43s
Run tests (ubuntu-22.04, 1.21)	7m 4s
Run tests (windows-2022, 1.22)	21m 16s
Run tests (macos-12, 1.22)	11m 42s
Run tests (macos-14, 1.22)	14m 16s
	1h 12m 32s

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