Add `as_dicts` to Fugue API

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c4ecb27) 100.00% compared to head (2f75cb2) 100.00%. Report is 1 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #522 +/- ## ========================================== Coverage 100.00% 100.00% ========================================== Files 128 128 Lines 12084 12306 +222 ========================================== + Hits 12084 12306 +222 ``` | [Files](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project) | Coverage Δ | | |---|---|---| | [fugue/api.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvYXBpLnB5) | `100.00% <ø> (ø)` | | | [fugue/dataframe/api.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvZGF0YWZyYW1lL2FwaS5weQ==) | `100.00% <100.00%> (ø)` | | | [fugue/dataframe/arrow\_dataframe.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvZGF0YWZyYW1lL2Fycm93X2RhdGFmcmFtZS5weQ==) | `100.00% <100.00%> (ø)` | | | [fugue/dataframe/dataframe.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvZGF0YWZyYW1lL2RhdGFmcmFtZS5weQ==) | `100.00% <100.00%> (ø)` | | | [fugue/dataframe/function\_wrapper.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvZGF0YWZyYW1lL2Z1bmN0aW9uX3dyYXBwZXIucHk=) | `100.00% <100.00%> (ø)` | | | [fugue/dataframe/iterable\_dataframe.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvZGF0YWZyYW1lL2l0ZXJhYmxlX2RhdGFmcmFtZS5weQ==) | `100.00% <100.00%> (ø)` | | | [fugue/dataframe/pandas\_dataframe.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvZGF0YWZyYW1lL3BhbmRhc19kYXRhZnJhbWUucHk=) | `100.00% <100.00%> (ø)` | | | [fugue/dataframe/utils.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvZGF0YWZyYW1lL3V0aWxzLnB5) | `100.00% <100.00%> (ø)` | | | [fugue/execution/execution\_engine.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvZXhlY3V0aW9uL2V4ZWN1dGlvbl9lbmdpbmUucHk=) | `100.00% <100.00%> (ø)` | | | [fugue/plugins.py](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project#diff-ZnVndWUvcGx1Z2lucy5weQ==) | `100.00% <ø> (ø)` | | | ... and [8 more](https://app.codecov.io/gh/fugue-project/fugue/pull/522?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fugue-project) | |

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