feat: expose health checks in middleware

[hperl]

Expose health checks in middleware

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Merging #1058 (2f7e0de) into master (878089d) will increase coverage by 0.42%.
The diff coverage is 93.10%.

@@            Coverage Diff             @@
##           master    #1058      +/-   ##
==========================================
+ Coverage   77.74%   78.16%   +0.42%     
==========================================
  Files          83       83              
  Lines        3841     4008     +167     
==========================================
+ Hits         2986     3133     +147     
- Misses        578      596      +18     
- Partials      277      279       +2     

Impacted Files	Coverage Δ
middleware/definitions.go	79.31% <0.00%> (-5.88%)	⬇️
driver/configuration/provider_koanf.go	87.34% <100.00%> (+1.29%)	⬆️
driver/registry_memory.go	89.82% <0.00%> (-3.93%)	⬇️
internal/cloudstorage/useragent.go	100.00% <0.00%> (ø)

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