API Core v1.0.0 release plan

[theacodes]

• Merge the one breaking change for api_core. Revert "Revert "api_core: Make PageIterator.item_to_value public. (#4702)"" #4734 Use public item_to_value property in Trace and Logging #4947
• Update the version ranges on all packages to set the upper bound to <2.0.0dev. Update dependency range for api-core to include v1.0.0 releases #4944
• Release api_core v1.0.0. Release api_core 1.0.0 #4945
• Update bigquery, datastore, logging, trace, and spanner to require a lower bound of >=1.0.0. Update minimum api-core version to 1.0.0 for Datastore, BigQuery, Logging, Trace, and Spanner #4946
• Release the rest of the world.
• Deprecate gax Deprecate this library gax-python#209.
• Tag/release gax to update PyPI metadata.

[theacodes]

Release PRs:

• BigQuery: Release bigquery 0.31.0 #4948
• BigQuery Datatransfer: Release bigquery_datatransfer 0.1.1 #4949
• Bigtable: Release bigtable 0.29.0 #4951
• Container: Release container 0.1.1 #4952
• Core: Release core 0.28.1 #4953
• Datastore: Release datastore 1.6.0 #4955
• DLP: Release dlp 0.1.1 #4956
• DNS: Release dns 0.29.0 #4957
• Error reporting: Release error_reporting 0.29.1 #4958
• Firestore: Release firestore 0.29.0 #4959
• Language: Release language 1.0.1 #4960
• Logging: Release logging 1.6.0 #4961
• Monitoring: Release monitoring 0.28.1 #4962
• OS Login: Release oslogin 0.1.1 #4963
• Pub/Sub: Release pubsub 0.32.1 #4964.
• Resource manager: Release resource_manager 0.28.1 #4965.
• Runtimeconfig: Release runtimeconfig 0.28.1 #4966.
• Spanner: Release spanner 1.1.0 #4967.
• Speech: Release speech 0.32.1 #4968.
• Storage: Release storage 1.8.0 #4969.
• Trace: Release trace 0.19.0 #4970.
• Translate: Release translate 1.3.1 #4971.
• Video intelligence: Release videointelligence 1.0.1 #4972.
• Vision: Release vision 0.30.1 #4973.

[theacodes]

Note: since there are so many releases do here, the PRs will be merged but I will not tag them until all of the PRs have been merged. I don't want to get into a situation where users can't install all of the latest libraries together.

To that end, I will tag in this order:

First group:

• core

Second group:

• BigQuery datatransfer
• bigtable
• container
• dlp
• dns
• error reporting
• firestore
• language
• monitoring
• os login
• resource manager
• runtime config
• speech
• storage
• translate
• video
• vision

Third group:

• bigquery
• datastore
• logging
• trace
• spanner

[theacodes]

All release PRs merged.

[theacodes]

First group of packages has been tagged, awaiting Circle to publish them before tagging the second group.

[theacodes]

Second group tagged.

[theacodes]

Second group published, tagging third group

[theacodes]

Third group tagged

[theacodes]

This is all done.