feat(gateway) add support for gateway api experimental ListenerSet

[bmhughes]

What does it do ?

Support the use of ListenerSetswith Gateway API.

Motivation

Using Gateway API and TLS without ListenerSets requires either wildcard certs or all hosts to be known when creating the gateway, ListenerSets removes with requirement but external-dns does not support them currently.

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[k8s-ci-robot]

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: bmhughes / name: Ben Hughes (40b93de)

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @bmhughes. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mloiseleur]

Would you please also complete the example just below accordingly?

[mloiseleur]

/ok-to-test

[coveralls]

Pull Request Test Coverage Report for Build 20059296334

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 165 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.1%) to 78.543%

---

Files with Coverage Reduction	New Missed Lines	%
apis/externaldns/types.go	1	99.71%
store.go	58	39.07%
gateway.go	106	79.46%

Totals
Change from base Build 20056240751:	-0.1%
Covered Lines:	16084
Relevant Lines:	20478

---

💛 - Coveralls