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ARROW-10947: [Rust][DataFusion] Optimize UTF8 to Date32 Conversion

After adding benchmarking capability to the UTF8 to Date32/Date64 CAST functions there was opportunity to improve the performance.

This PR uses inbuilt `chrono` functionality to calculate the number of days since CE then uses a constant to calculate the offset days relative to 1970-01-01. This improves performance around 10% for this operation relative to the `since` function presumably as `chrono` does not have to ensure the `from_ymd` is a valid date.

Before:
```
cast utf8 to date32 512 time:   [41.966 us 42.508 us 43.087 us]
cast utf8 to date32 512 time:   [40.591 us 40.661 us 40.740 us]
cast utf8 to date32 512 time:   [40.825 us 40.878 us 40.916 us]
```

After:
```
cast utf8 to date32 512 time:   [36.557 us 36.839 us 37.200 us]
cast utf8 to date32 512 time:   [35.997 us 36.442 us 36.919 us]
cast utf8 to date32 512 time:   [35.750 us 35.969 us 36.160 us]
```

Closes #8943 from seddonm1/utf8-date32-optimize

Authored-by: Mike Seddon <seddonm1@gmail.com>
Signed-off-by: Jorge C. Leitao <jorgecarleitao@gmail.com>