Implement auth0_resource_server data source

[bobhigs]

Proposed Changes

• Implement a data source for auth0_resource_server

Acceptance Test Output

$ make testacc TESTARGS="-run TestAccDataSourceResourceServer"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./auth0 -v -count 1 -parallel 10 -run TestAccDataSourceResourceServer -timeout 15m -coverprofile="c.out"
=== RUN   TestAccDataSourceResourceServer
=== PAUSE TestAccDataSourceResourceServer
=== CONT  TestAccDataSourceResourceServer
--- PASS: TestAccDataSourceResourceServer (10.18s)
PASS
coverage: 7.6% of statements
ok      github.com/alekc/terraform-provider-auth0/auth0 11.166s coverage: 7.6% of statements

Community Note

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Checklist

• [x] All added fields have proper documentation properties set up
• [x] All tests are passing
• [x] Any new code is covered by test coverage
• [x] Example files (in /example folder) have been amended

[alekc]

/ok-to-test sha=d1e610f

[alekc]

Thanks!