Add own ACME client implementation

[komuw]

• This was necessary in order to exact control on that process and also so as to enhance debugging experience for ACME failures.

[codecov-commenter]

Codecov Report

Patch coverage: 61.54% and project coverage change: -5.41 ⚠️

Comparison is base (a97aa95) 78.79% compared to head (3113fb3) 73.39%.

❗ Current head 3113fb3 differs from pull request most recent head 1cb911d. Consider uploading reports for the commit 1cb911d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #294      +/-   ##
==========================================
- Coverage   78.79%   73.39%   -5.41%     
==========================================
  Files          39       42       +3     
  Lines        3556     4792    +1236     
==========================================
+ Hits         2802     3517     +715     
- Misses        622     1022     +400     
- Partials      132      253     +121     

Impacted Files	Coverage Δ
id/uuid.go	86.95% <ø> (ø)
server/cert.go	32.15% <0.00%> (ø)
server/tls_conf.go	47.05% <27.27%> (-2.20%)	⬇️
internal/acme/kind.go	34.09% <34.09%> (ø)
internal/acme/client.go	60.30% <60.30%> (ø)
internal/acme/helpers.go	61.00% <61.00%> (ø)
internal/acme/acme.go	62.54% <62.54%> (ø)
internal/acme/http_client.go	69.18% <69.18%> (ø)
middleware/middleware.go	100.00% <100.00%> (ø)
mux/mux.go	80.24% <100.00%> (+4.12%)	⬆️
... and 1 more

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