Add support for new mTLS certificate store API

[vasilzhigilei]

Description

Adding mTLS cert store API endpoints to cloudflare-go in order to add mTLS cert store to Cloudflare terraform.

Has your change been tested?

Added tests for API responses.

Types of changes

What sort of change does your code introduce/modify?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• This change is using publicly documented (api.cloudflare.com or developers.cloudflare.com) and stable APIs.

[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	Secret	Commit	Filename
-	Generic Private Key	02e5fb1	mtls_certificates_test.go	View secret
-	Generic Private Key	06a1da1	mtls_certificates_test.go	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.

---

<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.

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[github-actions]

changelog detected ✅

[codecov-commenter]

Codecov Report

Merging #1150 (54b0448) into master (4ddb00c) will decrease coverage by 0.57%.
The diff coverage is 54.63%.

@@            Coverage Diff             @@
##           master    #1150      +/-   ##
==========================================
- Coverage   50.11%   49.53%   -0.58%     
==========================================
  Files         121      127       +6     
  Lines       11722    12137     +415     
==========================================
+ Hits         5874     6012     +138     
- Misses       4565     4758     +193     
- Partials     1283     1367      +84     

Impacted Files	Coverage Δ
device_posture_rule.go	61.80% <ø> (ø)
errors.go	40.78% <ø> (ø)
pages_deployment.go	34.24% <ø> (-0.24%)	⬇️
pages_domain.go	71.27% <ø> (ø)
pages_project.go	50.81% <ø> (ø)
rulesets.go	35.09% <ø> (ø)
workers_account_settings.go	29.41% <0.00%> (-6.31%)	⬇️
workers_tail.go	52.00% <ø> (ø)
workers_secrets.go	29.41% <28.00%> (-16.05%)	⬇️
workers_cron_triggers.go	29.41% <29.41%> (-16.05%)	⬇️
... and 11 more

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[github-actions]

This functionality has been released in v0.58.0.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!