Fix connection display name

[alexkappa]

Proposed Changes

• Add display_name to auth0_connection resource.

Fixes #288

Acceptance Test Output

$ make testacc TESTS=TestAccConnectionSAML                                                                                                         [18:52:07]
==> Checking that code complies with gofmt requirements...
?       github.com/alexkappa/terraform-provider-auth0   [no test files]
=== RUN   TestAccConnectionSAML
--- PASS: TestAccConnectionSAML (2.08s)
PASS
coverage: 10.6% of statements
ok      github.com/alexkappa/terraform-provider-auth0/auth0     2.377s  coverage: 10.6% of statements

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[github-actions]

This PR has become stale as it has been open 30 days with no activity.
Stale PRs will be closed after 5 days if no action is taken. If you
think this PR should not be closed, remove the stale label.

[rabidscorpio]

@alexkappa Is there a reason this was never merged? This would be really nice to have instead of having to edit the connection manually.

[rabidscorpio]

@yvovandoorn This PR was also only closed for being stale, can you please look at this?