Provide back button navigation in new cluster wizard

[angelozerr]

Provide back button navigation in new cluster wizard

Fixes #21

Signed-off-by: azerr azerr@redhat.com

[angelozerr]

This PR improves the two wizards:

• create cluster
• add topic

with:

• back button
• validation
• default value

for add topic, if you execute add topic from command palette it provides list of cluster to pick it at first.

Here a demo with cluster wizard:

Here a demo with topic wizard:

I need to improve this PR:

• with topic name validation (to have the same validation than https://github.com/apache/kafka/blob/8007211cc982d8458223e866c1ee7d94b69e0249/core/src/main/scala/kafka/common/Topic.scala#L33
• re-read my code to clean it if it is required
• understand why the PR is failing ?

[angelozerr]

@jlandersen my PR fails on windows only when tests are executed, I don't understand why although I have not written some tests
https://github.com/jlandersen/vscode-kafka/pull/60/checks?check_run_id=1644491781

Have you some idea?

[fbricon]

Use simple messages like "X is required"

Check for blank values: "X can not be blank"

[angelozerr]

Use simple messages like "X is required"

Check for blank values: "X can not be blank"

Done, I updated my PR and now we have a validators.ts which provides commons validator for required filed, positive number etc which follows the same pattern message.

[fbricon]

Topic name validation is wrong. _ should be accepted (as explained in the error message)

[fbricon]

Thanks @angelozerr. This makes the wizard workflows much better. Now on to #64 and #65 to improve validation