Add varargs scope

[sadikovi]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

This PR adds new scope for variable length arguments list denoted as ..., for example,

void func(String ... args) {
  // code
}

Name of the scope is punctuation.definition.parameters.varargs and it is added to the parameters list of patterns.

Tested manually on different code snippets and added unittest.

Alternate Designs

None were considered, since the change is fairly straightforward. I did change scope name for this to
punctuation.definition.parameters.varargs.java.

Benefits

Adds new scope for varargs.

Possible Drawbacks

Should not be any, change is fairly minor and only affects parameters list for functions and methods.

Applicable Issues

Closes #129

[sadikovi]

@50Wliu @chbk would you mind reviewing this PR? Thanks!

[50Wliu]

.java

[sadikovi]

@50Wliu I updated the scope name. Can you have a look again? Thanks!