perf: detect plain format strings faster

[Viatorus]

10 times faster but requires some (~10-160) more bytes

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (58b931f) 99.41% compared to head (33926df) 99.38%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #59 +/- ## ========================================== - Coverage 99.41% 99.38% -0.04% ========================================== Files 55 56 +1 Lines 5648 5680 +32 ========================================== + Hits 5615 5645 +30 - Misses 33 35 +2 ``` | [Files](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert) | Coverage Δ | | |---|---|---| | [include/emio/detail/args.hpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-aW5jbHVkZS9lbWlvL2RldGFpbC9hcmdzLmhwcA==) | `100.00% <100.00%> (ø)` | | | [include/emio/detail/format/args.hpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-aW5jbHVkZS9lbWlvL2RldGFpbC9mb3JtYXQvYXJncy5ocHA=) | `100.00% <ø> (ø)` | | | [include/emio/detail/scan/args.hpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-aW5jbHVkZS9lbWlvL2RldGFpbC9zY2FuL2FyZ3MuaHBw) | `100.00% <ø> (ø)` | | | [include/emio/detail/scan/scan\_from.hpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-aW5jbHVkZS9lbWlvL2RldGFpbC9zY2FuL3NjYW5fZnJvbS5ocHA=) | `100.00% <100.00%> (ø)` | | | [include/emio/detail/validated\_string.hpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-aW5jbHVkZS9lbWlvL2RldGFpbC92YWxpZGF0ZWRfc3RyaW5nLmhwcA==) | `100.00% <100.00%> (ø)` | | | [include/emio/format.hpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-aW5jbHVkZS9lbWlvL2Zvcm1hdC5ocHA=) | `100.00% <100.00%> (ø)` | | | [include/emio/scan.hpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-aW5jbHVkZS9lbWlvL3NjYW4uaHBw) | `100.00% <100.00%> (ø)` | | | [test/unit\_test/test\_format\_string.cpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-dGVzdC91bml0X3Rlc3QvdGVzdF9mb3JtYXRfc3RyaW5nLmNwcA==) | `100.00% <100.00%> (ø)` | | | [test/unit\_test/test\_format\_to\_api.cpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-dGVzdC91bml0X3Rlc3QvdGVzdF9mb3JtYXRfdG9fYXBpLmNwcA==) | `100.00% <100.00%> (ø)` | | | [test/unit\_test/test\_scan.cpp](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-dGVzdC91bml0X3Rlc3QvdGVzdF9zY2FuLmNwcA==) | `100.00% <100.00%> (ø)` | | | ... and [2 more](https://app.codecov.io/gh/Viatorus/emio/pull/59?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert) | |

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