add tab extension to dev console

[jgbernalp]

This PR adds a new extension type to be able to add tabs on the HosrizontalNav component in specific sections

https://issues.redhat.com/browse/OU-49

[jgbernalp]

/retest

[spadgett]

/cc /cc @christianvogt

[jgbernalp]

/retest-required

[christianvogt]

minor comment but otherwise looks good /approve

[jgbernalp]

/assign @yapei @opayne1 @RickJWagner for approvals

[RickJWagner]

/label px-approved

[opayne1]

/label docs-approved

[yapei]

with console.tab extension and all required property defined, user can add tab to any specific page matching with contextId /label qe-approved

[christianvogt]

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: christianvogt, jgbernalp

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Needs approval from an approver in each of these files:

• ~~dynamic-demo-plugin/OWNERS~~ [christianvogt]
• ~~frontend/OWNERS~~ [christianvogt]

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[jgbernalp]

/retest-required

[openshift-ci[bot]]

@jgbernalp: all tests passed!

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