Publish to OpenVSX

[comnori]

To use ProjectIDX and Theia, distribution of OpenVSX is required.

[comnori]

• OpenVSX namespace registration completed
• Claiming namespace comnori EclipseFdn/open-vsx.org#2253

[comnori]

This may also have the same issue, should check it along with that issue.

• Publish to OpenVSX vscode-java-pack#2 (comment)