add support for erf

[rcalxrc08]

solves #48

[mBarreau]

The manifest file must be added as well.

[rcalxrc08]

Why don't you instantiate the package? Usually you don't commit the Manifest file. Anyway I don't have julia 1.9.0, my manifest for the benchmarks is quite different from the commited one.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05% :tada:

Comparison is base (41c99f4) 86.25% compared to head (2842515) 86.30%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #49 +/- ## ========================================== + Coverage 86.25% 86.30% +0.05% ========================================== Files 6 6 Lines 240 241 +1 ========================================== + Hits 207 208 +1 Misses 33 33 ``` | [Files Changed](https://app.codecov.io/gh/JuliaDiff/TaylorDiff.jl/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff) | Coverage Δ | | |---|---|---| | [src/codegen.jl](https://app.codecov.io/gh/JuliaDiff/TaylorDiff.jl/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2NvZGVnZW4uamw=) | `100.00% <100.00%> (ø)` | |

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[tansongchen]

The reason for committing Manifest.toml to this repo is that we want exactly the same version of dependency packages on each benchmark run, so that we can make sure the time difference from run to run is caused by a change of our performance, not others. Looks good, will merge