feat: add `SearchCustomization` metadata support #938

Job	Run time
megalinter	1m 26s
npm-lint	1m 6s
pull-request-lint	3s
commit-lint	1m 19s
build / source	2m 10s
publish-dev	1m 19s
e2e-check / e2e-test (macos-latest, 18, sfdx-cli)	1m 0s
e2e-check / e2e-test (macos-latest, 18, @salesforce/cli)	52s
e2e-check / e2e-test (macos-latest, 20, sfdx-cli)	1m 25s
e2e-check / e2e-test (macos-latest, 20, @salesforce/cli)	55s
e2e-check / e2e-test (windows-latest, 18, sfdx-cli)	5m 5s
e2e-check / e2e-test (windows-latest, 18, @salesforce/cli)	5m 33s
e2e-check / e2e-test (windows-latest, 20, sfdx-cli)	9m 28s
e2e-check / e2e-test (windows-latest, 20, @salesforce/cli)	5m 31s
e2e-check / e2e-test (ubuntu-latest, 18, sfdx-cli)	47s
e2e-check / e2e-test (ubuntu-latest, 18, @salesforce/cli)	39s
e2e-check / e2e-test (ubuntu-latest, 20, sfdx-cli)	57s
e2e-check / e2e-test (ubuntu-latest, 20, @salesforce/cli)	37s
	40m 12s

Provide feedback