feature: BigQuery Support

[nicolepng]

issue #186

[codecov[bot]]

Codecov Report

Patch coverage: 88.67% and project coverage change: -0.46 :warning:

Comparison is base (ac07c54) 83.98% compared to head (2ebd6f5) 83.53%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #224 +/- ## ========================================== - Coverage 83.98% 83.53% -0.46% ========================================== Files 8 8 Lines 487 504 +17 Branches 84 87 +3 ========================================== + Hits 409 421 +12 - Misses 65 68 +3 - Partials 13 15 +2 ``` | [Impacted Files](https://app.codecov.io/gh/tokern/piicatcher/pull/224?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tokern) | Coverage Δ | | |---|---|---| | [piicatcher/scanner.py](https://app.codecov.io/gh/tokern/piicatcher/pull/224?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tokern#diff-cGlpY2F0Y2hlci9zY2FubmVyLnB5) | `93.90% <ø> (ø)` | | | [piicatcher/generators.py](https://app.codecov.io/gh/tokern/piicatcher/pull/224?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tokern#diff-cGlpY2F0Y2hlci9nZW5lcmF0b3JzLnB5) | `85.91% <66.66%> (-5.00%)` | :arrow_down: | | [piicatcher/dbinfo.py](https://app.codecov.io/gh/tokern/piicatcher/pull/224?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tokern#diff-cGlpY2F0Y2hlci9kYmluZm8ucHk=) | `94.28% <95.12%> (-0.55%)` | :arrow_down: |

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