Feat: Add projects to Terraform Provider

[DanielHougaard]

This PR introduces projects support for the Infisical Terraform Provider.

On the data source you can access environments by the environment slug like seen below.

You access environments like so, infisical_projects.test-project.environments["dev"]. The reason for making it accessible like an object rather than on an array-basis, is to improve the user experience when interacting with environments. This also conveniently fits our secrets implementation.

⚠️ Do not merge/release before the V2 project-slug based router (Infisical/infisical#1449) is released.

[gitguardian]

⚠️ GitGuardian has uncovered 2 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
9650964	Triggered	Generic High Entropy Secret	11bde16	examples/resources/infisical_project/resource.tf	View secret
9650964	Triggered	Generic High Entropy Secret	5d3bed4	examples/resources/infisical_project/resource.tf	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secrets safely. Learn here the best practices.
3. Revoke and rotate these secrets.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

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<sup>🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.

Our GitHub checks need improvements? Share your feedbacks!</sup>

[maidul98]

Looks solid, really good work! Once we get the API PR merged, i'll try this out manually

[maidul98]

lgtm!