Simplification of version bumping

[antixar]

Tell us about the problem you're trying to solve

Now we force to write every new version to 4 different places:
airbyte-config/init/src/main/resources/config/STANDARD_SOURCE_DEFINITION/<connector_uuid>.json
airbyte-config/init/src/main/resources/seed/source_definitions.yaml
airbyte-integrations/connectors/<connector_name>/Dockerfile
airbyte-integrations/connectors/<connector_name>/setup.py
+
And update doc files:
docs/SUMMARY.md
docs/integrations/README.md
airbyte-integrations/builds.md

On my opinion it is tough for support and is the reason of merge conflicts.

Describe the solution you’d like

We can automate updating of these files during the publish command.

1. The source of truth should be one of the following variants:

• setup.py file. Certainly these options are available for Python packages but I'm sure that Java has a similar one.
  For this we can use the following package options:

  - name  - <connector_unique_name>
  - version -  <connector_version>
  --long-description -  <connector_doc_filepath> or <docfile_full>
  --classifiers - <connector_grade>

• Dockerfile. And It will be unified approach for all languages. For this we can use the following labels:

LABEL io.airbyte.name=airbyte/<connector_unique_name>
LABEL io.airbyte.version=<connector_version>
LABEL io.airbyte.grade=<connector_grade>
LABEL io.airbyte.docfile=<connector_doc_filepath>

2. <connector_uuid> can be generated automatically for all new connectors(checking of the source_definitions.yaml file)
3. <connector_doc_file_path> - should be saved into connectors' folders(e.g.: airbyte-integrations/connectors/<connector_name>/<connector_name>.md) And the publish command will create a symlink to the needed place.
4. <connector_grade> will be used for updating of docs/integrations/README.md
5. As result this CI job will add a new commit to a relevant branch if needed.

The main benefit is that all developer will support 2 files only (docfile and setup.py/Dockerfile)

And I'm ready to implement this.

[antixar]

Same issue #1866

[sherifnada]

I suggest we use the dockerfile as the single source of truth. and btw we don't need to do this for the .json file as they are no longer needed to be updated (they are just kept for backwards compat on older airbyte versions, will be removed eventually)

[girarda]

the flow improved a lot over the last year