* fix: make TablesClient.predict permissive to input data types

The current implementation checks input instance's data type according
to column spec's data type. E.g., if the column spec is float, it
requires the input to be float or int, but not string. However, this
is not the same as tables API contract:

   float column data type could be string or number values.

The current code raises exception with error messages like

    TypeError: '0' has type str, but expected one of: int, long, float
    when passed in a string value for numeric columns, which should be
    allowed.

This PR changes the logic so that Python SDK side will be permissive
for the input data type - basically all JSON compatible data types are
allow. And rely on backend for the validation.

* Fix according to comment.

* Fix lint.

* Address comment: use elif instead of if

Co-authored-by: Helin Wang <[email protected]>

* chore: installs test_utils from common repo

* fix: pins sphinx<3.0.0

* chore: deletes redundant test_utils dir

* chore: use published test_utils package

Co-authored-by: Bu Sun Kim <[email protected]>

Release-As: 1.0.0

🤖 I have created a release \*beep\* \*boop\* 
---
## [1.0.0](https://www.github.com/googleapis/python-automl/compare/v0.10.0...v1.0.0) (2020-06-18)


### Features

* release as production/stable ([#37](https://www.github.com/googleapis/python-automl/issues/37)) ([915c502](https://www.github.com/googleapis/python-automl/commit/915c5029a8c342871738b24395534fdaebb681bc))


### Bug Fixes

* make TablesClient.predict permissive to input data types ([#13](https://www.github.com/googleapis/python-automl/issues/13)) ([ddc9f71](https://www.github.com/googleapis/python-automl/commit/ddc9f7106eab91d4adea2db65e69e3a870a7cd46))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please).

🤖 I have created a release \*beep\* \*boop\* 
---
### [1.0.1](https://www.github.com/googleapis/python-automl/compare/v1.0.0...v1.0.1) (2020-06-18)


### Bug Fixes

* fixes release status trove classifier ([#39](https://www.github.com/googleapis/python-automl/issues/39)) ([5b5d6c3](https://www.github.com/googleapis/python-automl/commit/5b5d6c33178f4f052cba01cc08cf3023d4303d7a))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please).