Support Ed25519 public/private key generation

[kaidence]

Hi! I've been looking to generate Ed25519 keys through Terraform. Unfortunately, this was missing from the official TLS provider. I took a stab at adding support for this. The changes are:

1. Updates the vendored golang.org/x/crypto
2. Adds support for Ed25519 in resource_private_key.go, relying on golang.org/x/crypto/ed25519

I'd love for someone to take a look and see whether this is something that could be included in the mainline terraform-provider-tls repository.

[kaidence]

The CI fails since the upgraded golang.org/x/crypto package relies on Go 1.9 or higher. Would there be interest in upgrading the required Go version for this project too?

[adamdecaf]

@kaidence I created #33 and PR'd the template project too.

[kaidence]

@adamdecaf Wonderful, thank you so much!

[kaidence]

Closing this while I get permission from my employer, will reopen once I get that

[detro]

Thank you for your time and contribution, we really appreciate it. As part of a bigger effort to add complete support for ED25519 key algorithm, I’m closing this in favor of issue #150. Please refer to the new issue for what will be included and how work will proceed.

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active contributions.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.