refactor: migrate to typescript #562

Job	Run time
mutation-testing	2m 53s
commit-lint	1m 57s
megalinter	2m 28s
npm-lint	2m 6s
pull-request-lint	2s
build / source	3m 32s
e2e-check (macos-latest, 16, sfdx-cli)	6m 22s
e2e-check (macos-latest, 16, @salesforce/cli)	5m 1s
e2e-check (macos-latest, 18, sfdx-cli)	6m 44s
e2e-check (macos-latest, 18, @salesforce/cli)	8m 14s
e2e-check (macos-latest, 20, sfdx-cli)	8m 3s
e2e-check (macos-latest, 20, @salesforce/cli)	6m 18s
e2e-check (windows-latest, 16, sfdx-cli)	10m 26s
e2e-check (windows-latest, 16, @salesforce/cli)	10m 16s
e2e-check (windows-latest, 18, sfdx-cli)	11m 28s
e2e-check (windows-latest, 18, @salesforce/cli)	10m 21s
e2e-check (windows-latest, 20, sfdx-cli)	13m 13s
e2e-check (windows-latest, 20, @salesforce/cli)	8m 57s
e2e-check (ubuntu-latest, 16, sfdx-cli)	3m 54s
e2e-check (ubuntu-latest, 16, @salesforce/cli)	3m 25s
e2e-check (ubuntu-latest, 18, sfdx-cli)	3m 45s
e2e-check (ubuntu-latest, 18, @salesforce/cli)	3m 47s
e2e-check (ubuntu-latest, 20, sfdx-cli)	3m 32s
e2e-check (ubuntu-latest, 20, @salesforce/cli)	3m 57s
	2h 20m 41s

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