Implement auth0_connections data source

[bobhigs]

Proposed Changes

• Implement a data source auth0_connections for querying multiple connections for Auth0, optionally filtering by name or strategy
  • Note: When running the tests, there must be no extra connections on the Auth0 tenant or some of them will fail.
• Add an IsAuth0Strategy validation function

Fixes #0000

Acceptance Test Output

$ make testacc TESTARGS="-run TestAccDataSourceConnections"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./auth0 -v -count 1 -parallel 10 -run TestAccDataSourceConnections -timeout 15m -coverprofile="c.out"
=== RUN   TestAccDataSourceConnections_NoConnections
--- PASS: TestAccDataSourceConnections_NoConnections (3.28s)
=== RUN   TestAccDataSourceConnections_InvalidStrategy
--- PASS: TestAccDataSourceConnections_InvalidStrategy (0.32s)
=== RUN   TestAccDataSourceConnections_NoFilter
--- PASS: TestAccDataSourceConnections_NoFilter (4.08s)
=== RUN   TestAccDataSourceConnections_ByName
--- PASS: TestAccDataSourceConnections_ByName (10.92s)
=== RUN   TestAccDataSourceConnections_BySingleStrategy
--- PASS: TestAccDataSourceConnections_BySingleStrategy (4.38s)
=== RUN   TestAccDataSourceConnections_ByMultipleStrategies
--- PASS: TestAccDataSourceConnections_ByMultipleStrategies (4.26s)
=== RUN   TestAccDataSourceConnections_ByNameAndStrategy
--- PASS: TestAccDataSourceConnections_ByNameAndStrategy (10.50s)
PASS
coverage: 12.6% of statements
ok      github.com/alekc/terraform-provider-auth0/auth0 37.944s coverage: 12.6% of statements

$ make testacc TESTARGS="-run TestAccConnection"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./auth0 -v -count 1 -parallel 10 -run TestAccConnection -timeout 15m -coverprofile="c.out"
=== RUN   TestAccConnection
--- PASS: TestAccConnection (8.89s)
=== RUN   TestAccConnection_NonPersistentAttrs
--- PASS: TestAccConnection_NonPersistentAttrs (5.34s)
=== RUN   TestAccConnectionAD
--- PASS: TestAccConnectionAD (3.05s)
=== RUN   TestAccConnectionAzureAD
--- PASS: TestAccConnectionAzureAD (4.31s)
=== RUN   TestAccConnectionOIDC
--- PASS: TestAccConnectionOIDC (5.06s)
=== RUN   TestAccConnectionOAuth2
--- PASS: TestAccConnectionOAuth2 (5.14s)
=== RUN   TestAccConnectionWithEnabledClients
--- PASS: TestAccConnectionWithEnabledClients (10.53s)
=== RUN   TestAccConnectionSMS
--- PASS: TestAccConnectionSMS (2.74s)
=== RUN   TestAccConnectionEmail
--- PASS: TestAccConnectionEmail (4.94s)
=== RUN   TestAccConnectionSalesforce
--- PASS: TestAccConnectionSalesforce (2.96s)
=== RUN   TestAccConnectionGoogleOAuth2
--- PASS: TestAccConnectionGoogleOAuth2 (2.70s)
=== RUN   TestAccConnectionFacebook
--- PASS: TestAccConnectionFacebook (5.44s)
=== RUN   TestAccConnectionApple
--- PASS: TestAccConnectionApple (5.31s)
=== RUN   TestAccConnectionLinkedin
--- PASS: TestAccConnectionLinkedin (5.16s)
=== RUN   TestAccConnectionGitHub
--- PASS: TestAccConnectionGitHub (2.62s)
=== RUN   TestAccConnectionWindowslive
--- PASS: TestAccConnectionWindowslive (5.04s)
=== RUN   TestAccConnectionConfiguration
--- PASS: TestAccConnectionConfiguration (4.66s)
=== RUN   TestAccConnection_SAML
--- PASS: TestAccConnection_SAML (5.07s)
PASS
coverage: 22.3% of statements
ok      github.com/alekc/terraform-provider-auth0/auth0 89.214s coverage: 22.3% 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]

@bobhigs thanks for your submissions, I will have a look at them as soon as possible (my apologies in advance, this period is a tiny bit busy for me)