[Feature] Add silhouette loss

[codecov-commenter]

Codecov Report

Attention: 43 lines in your changes are missing coverage. Please review.

Comparison is base (3a6b403) 58.68% compared to head (7129445) 58.49%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #147 +/- ## ========================================== - Coverage 58.68% 58.49% -0.19% ========================================== Files 185 186 +1 Lines 11608 11659 +51 ========================================== + Hits 6812 6820 +8 - Misses 4796 4839 +43 ``` | [Flag](https://app.codecov.io/gh/openxrlab/xrmocap/pull/147/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openxrlab) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/openxrlab/xrmocap/pull/147/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openxrlab) | `58.49% <15.68%> (-0.19%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openxrlab#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/openxrlab/xrmocap/pull/147?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openxrlab) | Coverage Δ | | |---|---|---| | [xrmocap/model/loss/builder.py](https://app.codecov.io/gh/openxrlab/xrmocap/pull/147?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openxrlab#diff-eHJtb2NhcC9tb2RlbC9sb3NzL2J1aWxkZXIucHk=) | `100.00% <100.00%> (ø)` | | | [xrmocap/model/loss/silhouette\_loss.py](https://app.codecov.io/gh/openxrlab/xrmocap/pull/147?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openxrlab#diff-eHJtb2NhcC9tb2RlbC9sb3NzL3NpbGhvdWV0dGVfbG9zcy5weQ==) | `12.24% <12.24%> (ø)` | |

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