Use semantic types for registration expiration helpers' input

[tk-o]

This issue requires updating all helpers in the packages/ensnode-sdk/src/registrars/registration-expiration.ts file to use semantic types (UnixTimestamp, Duration) instead of native JS types (i.e. bigint).

Please note, that it might not be a straightforward update due to the max allowed expiry value:

ensnode/packages/integration-test-env/src/seed/registrar.ts

Lines 37 to 41 in af444c3

	/**
	* Maximum expiry value for ENSv2 names (2^64 - 1).
	* @see https://github.com/ensdomains/contracts-v2/blob/main/contracts/script/deploy-constants.ts
	*/
	export const MAX_EXPIRY = (1n << 64n) - 1n;

See failing test cases for reference:
https://github.com/namehash/ensnode/actions/runs/29262138543/job/86857912354?pr=2350

[coderabbitai]

🔗 Related PRs

#1542 - Flip dependency relationship between the ens-referrals and ensnode-sdk packages [merged]
#1630 - refactor(ensnode-sdk) Duration schema [merged]
#1655 - Registration/Renewal Superceding Refactor [merged]
#1795 - fix: use block number for BlockRef ordering instead of number AND timestamp [merged]
#1907 - Changed accurateAsOf in Registrar Actions from optional to required [merged]

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