Parsing example object as plain string

[AceTheCreator]

Is your enhancement related to a problem? Please describe.

When the example is rendered in the tooltip, it looks like a long string, which makes it difficult to read and needs formatting when copied.

Describe the solution you would like

So I suggest we stringify this line of code https://github.com/redhat-developer/yaml-language-server/blob/main/src/languageservice/services/yamlHover.ts#L156 with JSON.stringify(example, null, 2) which makes the example stringified but with additional spaces, so it looks structured, readable and nice

Describe alternatives you have considered

None

Additional context

This is what the examples payload currently looks like in the tooltip, a long plain string