Use custom options for formating

[svor]

Che has an ability to import custom options for formatting by using this UI:

The file with options is the same as Eclipse uses.
So hove it works:

1. If user chooses Project and import the file it will be imported to projects/projectName/.che/
2. If user chooses Workspace and import the file it will be imported to projects/.che/

How the algorithm works:

• Firstly it will check if projects/projectName/.che/che-formatter.xml exists if it is - use it for formatting otherwise
• Check if projects/.che/che-formatter.xml exists if it is - use it otherwise
• Use default formatter settings

Now jdt.ls uses only default options for formatting. Need to improve it.

[svor]

It depends on #8557