feat: add Expression Set metadatas support #1057

Job	Run time
npm-lint	1m 9s
megalinter	1m 38s
commit-lint	1m 15s
pull-request-lint	3s
build / source	2m 10s
publish-dev	1m 22s
e2e-check / e2e-test (macos-latest, 18, sfdx-cli)	2m 10s
e2e-check / e2e-test (macos-latest, 18, @salesforce/cli)	44s
e2e-check / e2e-test (macos-latest, 20, sfdx-cli)	1m 33s
e2e-check / e2e-test (macos-latest, 20, @salesforce/cli)	49s
e2e-check / e2e-test (windows-latest, 18, sfdx-cli)	7m 35s
e2e-check / e2e-test (windows-latest, 18, @salesforce/cli)	5m 46s
e2e-check / e2e-test (windows-latest, 20, sfdx-cli)	7m 38s
e2e-check / e2e-test (windows-latest, 20, @salesforce/cli)	5m 29s
e2e-check / e2e-test (ubuntu-latest, 18, sfdx-cli)	57s
e2e-check / e2e-test (ubuntu-latest, 18, @salesforce/cli)	48s
e2e-check / e2e-test (ubuntu-latest, 20, sfdx-cli)	57s
e2e-check / e2e-test (ubuntu-latest, 20, @salesforce/cli)	41s
	42m 44s

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