Implement auth0_client data source

[bobhigs]

Proposed Changes

• Implement a data source for auth0_client
• Fix typos in auth0_client resource

Acceptance Test Output

$ make testacc TESTARGS="-run TestAccDataSourceClient"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./auth0 -v -count 1 -parallel 10 -run TestAccDataSourceClient -timeout 15m -coverprofile="c.out"
=== RUN   TestAccDataSourceClient_Common
=== PAUSE TestAccDataSourceClient_Common
=== RUN   TestAccDataSourceClientZeroValueCheck
=== PAUSE TestAccDataSourceClientZeroValueCheck
=== RUN   TestAccDataSourceClientJwtScopes
=== PAUSE TestAccDataSourceClientJwtScopes
=== RUN   TestAccDataSourceClientMobile
=== PAUSE TestAccDataSourceClientMobile
=== CONT  TestAccDataSourceClient_Common
=== CONT  TestAccDataSourceClientMobile
=== CONT  TestAccDataSourceClientJwtScopes
=== CONT  TestAccDataSourceClientZeroValueCheck
--- PASS: TestAccDataSourceClient_Common (16.46s)
--- PASS: TestAccDataSourceClientJwtScopes (27.64s)
--- PASS: TestAccDataSourceClientMobile (35.62s)
--- PASS: TestAccDataSourceClientZeroValueCheck (37.44s)
PASS
coverage: 15.4% of statements
ok      github.com/alekc/terraform-provider-auth0/auth0 37.695s coverage: 15.4% of statements

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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=389bf18

[alekc]

/ok-to-test sha=056676d