Self-scalable tanh

[codecov[bot]]

Codecov Report

Patch coverage: 35.71% and project coverage change: +0.08 :tada:

Comparison is base (56eee42) 29.96% compared to head (20b9cca) 30.05%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #201 +/- ## ========================================== + Coverage 29.96% 30.05% +0.08% ========================================== Files 15 15 Lines 971 985 +14 ========================================== + Hits 291 296 +5 - Misses 680 689 +9 ``` | [Impacted Files](https://app.codecov.io/gh/YichengDWu/Sophon.jl/pull/201?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Yicheng+Wu) | Coverage Δ | | |---|---|---| | [src/Sophon.jl](https://app.codecov.io/gh/YichengDWu/Sophon.jl/pull/201?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Yicheng+Wu#diff-c3JjL1NvcGhvbi5qbA==) | `100.00% <ø> (ø)` | | | [src/layers/activations.jl](https://app.codecov.io/gh/YichengDWu/Sophon.jl/pull/201?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Yicheng+Wu#diff-c3JjL2xheWVycy9hY3RpdmF0aW9ucy5qbA==) | `22.72% <35.71%> (+22.72%)` | :arrow_up: |

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