Add on type conversion of tab char to spaces

[datho7561]

What does this PR do?

Rebases #396

What issues does this PR fix or reference?

#244

Is it tested? How?

Through unit tests. It can't be tested in VS Code due to microsoft/vscode#247651 . It should be possible to test this in a different language client (perhaps Neovim, Helix, or Eclipse); I'll try that and update this PR accordingly.

[coveralls]

coverage: 84.195% (+0.02%) from 84.178%
when pulling f03bb1d on datho7561:convert-tab-to-spaces
into 2a2e614 on redhat-developer:main.

[mickaelistria]

Any chance for this to be merged?

[datho7561]

@mickaelistria I've rebased the PR. I haven't had a chance to manually test this in WildWebDeveloper, do you know how to setup WildWebDeveloper to use this PR so I can test it? I guess I could merge this untested, but that doesn't sound helpful.

[mickaelistria]

I think the "simplest" way to test it would require importing Wild Web Developer in your workspace;
Then npm install yaml-language-server with your change so it's available locally for future resolutions.
Then tweak the package.json in wildwebdeveloper to get your version of yaml-language-server used.
And mvn verify on org.eclipse.wildwebdeveloper
Then you should be able to Run As > Eclipse application and get Wild Web Developer using your yaml-language-server.

[datho7561]

Okay, thanks, I'll try this out