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 :warning:

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

:exclamation: 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

```diff @@ 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](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu) | Coverage Δ | | |---|---|---| | [id/uuid.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-aWQvdXVpZC5nbw==) | `86.95% <ø> (ø)` | | | [server/cert.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-c2VydmVyL2NlcnQuZ28=) | `32.15% <0.00%> (ø)` | | | [server/tls\_conf.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-c2VydmVyL3Rsc19jb25mLmdv) | `47.05% <27.27%> (-2.20%)` | :arrow_down: | | [internal/acme/kind.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-aW50ZXJuYWwvYWNtZS9raW5kLmdv) | `34.09% <34.09%> (ø)` | | | [internal/acme/client.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-aW50ZXJuYWwvYWNtZS9jbGllbnQuZ28=) | `60.30% <60.30%> (ø)` | | | [internal/acme/helpers.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-aW50ZXJuYWwvYWNtZS9oZWxwZXJzLmdv) | `61.00% <61.00%> (ø)` | | | [internal/acme/acme.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-aW50ZXJuYWwvYWNtZS9hY21lLmdv) | `62.54% <62.54%> (ø)` | | | [internal/acme/http\_client.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-aW50ZXJuYWwvYWNtZS9odHRwX2NsaWVudC5nbw==) | `69.18% <69.18%> (ø)` | | | [middleware/middleware.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-bWlkZGxld2FyZS9taWRkbGV3YXJlLmdv) | `100.00% <100.00%> (ø)` | | | [mux/mux.go](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-bXV4L211eC5nbw==) | `80.24% <100.00%> (+4.12%)` | :arrow_up: | | ... and [1 more](https://app.codecov.io/gh/komuw/ong/pull/294?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu) | |

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