Warning diagnostic appears on properties in bootstrap.properties

[turkeylurkey]

A warning underline appears in bootstrap.properties and a message in the problems view because lsp4mp does not recognise the property.

We need to investigate whether this message appears due to code in the client or if lsp4mp needs to be more careful.

Related to #592

[angelozerr]

A warning underline appears in bootstrap.properties and a message in the problems view because lsp4mp does not recognise the property.

It is because Microprofile Language Server mapping is mapped with Properties language and bootstrap.properties has Properties language. To fix this issue LSP4IJ provides documentMatcher to be more precise to map a file with a language server.

You will need to do the same thing than https://github.com/redhat-developer/intellij-quarkus/blob/3dd00d16abb2643537da759fcc98b5780ce3c155/src/main/resources/META-INF/lsp4ij-quarkus.xml#L21

[turkeylurkey]

Added a document matcher, thank you @angelozerr !!