Add support for `tinyvec`

[codecov[bot]]

Codecov Report

Patch coverage: 94.11% and project coverage change: +2.83 :tada:

Comparison is base (e5db185) 70.07% compared to head (aa6f7f9) 72.91%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #108 +/- ## ========================================== + Coverage 70.07% 72.91% +2.83% ========================================== Files 4 4 Lines 254 288 +34 ========================================== + Hits 178 210 +32 - Misses 76 78 +2 ``` | [Impacted Files](https://app.codecov.io/gh/Nullus157/bs58-rs/pull/108?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nullus157) | Coverage Δ | | |---|---|---| | [src/decode.rs](https://app.codecov.io/gh/Nullus157/bs58-rs/pull/108?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nullus157#diff-c3JjL2RlY29kZS5ycw==) | `64.92% <94.11%> (+4.24%)` | :arrow_up: | | [src/encode.rs](https://app.codecov.io/gh/Nullus157/bs58-rs/pull/108?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nullus157#diff-c3JjL2VuY29kZS5ycw==) | `81.60% <94.11%> (+1.97%)` | :arrow_up: |

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