By setting two environment variables

- GCLOUD_DATASET_ID
- GOOGLE_APPLICATION_CREDENTIALS

the user can call convenience methods in `gcloud.datastore` directly
without worrying about auth or the name of the dataset. The
goal is that in places like App Engine and Compute Engine, the
dataset ID can be implied without **any** user intervention.

Partially addresses googleapis#337.

NOTE: This still needs to be documented, but it's unclear
      where is appropriate. We also need to have documentation
      for auth (outside of CONTRIBUTING.md).

Incorporates feedback from @tseaver. Also
- Fixing bad tests that accidentally leave side-effects.
- Making the method to set the default dataset public.

dhermes deleted the implicit-dataset-from-environ branch

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Source-Link: googleapis/synthtool@0941ef3
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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

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Co-authored-by: Anthonios Partheniou <partheniou@google.com>

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* chore: test minimum dependencies in python 3.7

* update constraints

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Co-authored-by: Anthonios Partheniou <partheniou@google.com>

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* fix(deps): allow protobuf 3.19.5

* explicitly exclude protobuf 4.21.0

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…00:00:00` (#444)

* fix: read out-of-bounds DATETIME values such as `0001-01-01 00:00:00`

deps: require google-cloud-bigquery 1.26.1 or later

* feat:  accepts a table ID, which downloads the table without a query

* revert tests for read_gbq fix which isn't yet resolved

* Revert "revert tests for read_gbq fix which isn't yet resolved"

This reverts commit 2a76982df7cff48e58d8b1ad7eae19477665cb76.

* add todo for next steps

* add unit test for table ID read_gbq

* add helper for is_query

* implement read_gbq with table id

* fix remaining tests, don't localalize out-of-bounds timestamp columns

* Update pandas_gbq/gbq.py

* fix 3.7 unit tests

* correct coverage

* skip coverage for optional test skip

* fix  docs build

* improve test coverage for error case

* as of google-cloud-bigquery 1.11.0, get_table before list_rows is unnecessary

* refactor tests

* add more scalars

* add more types

* add failing time test

* add test for bignumeric

* add test for null values

* add epoch timestamps to tests

* add post-download dtype conversions

* add failing test for desired fix

* fix the issue with extreme datetimes

* fix constraints

* fix tests for empty dataframe

* fix tests for older google-cloud-bigquery

* ignore index on empty dataframe

* add db-dtypes to runtime import checks

* document dependencies

* remove TODO, since done

* remove unnecessary special case for empty dataframe

Fixes prerelease test run

* remove redundant 'deprecated' from comment

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Source-Link: googleapis/synthtool@993985f
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Source-Link: googleapis/synthtool@0ddbff8
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autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

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This reverts commit 054db75734756b0e82e7984ca07fa80025edc908.

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This reverts commit 7959874a6f09da750533d10f90d94320e082be76.

fixes #444

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