fix(eslint-plugin) indent: fix false positive on type parameters

[scottohara]

Fixes #119

As noted in #119, the following code was triggering the indent rule:

/*eslint @typescript-eslint/indent: ["error", 2, { "VariableDeclarator": { "const": 3} }]*/

const div: JQuery<HTMLElement> = $('<div>')
        .addClass('some-class')
        .appendTo($('body')),

      button: JQuery<HTMLElement> = $('<button>')
        .text('Cancel')
        .appendTo(div);

...but the following, almost identical, code was not:

/*eslint @typescript-eslint/indent: ["error", 2, { "VariableDeclarator": { "const": 3} }]*/

const div: JQuery = $('<div>')
        .addClass('some-class')
        .appendTo($('body')),

      button: JQuery = $('<button>')
        .text('Cancel')
        .appendTo(div);

The difference, it seems, is the type parameter: <HTMLElement>.

Comparing the two ASTs, I notice a node type that was not included in the KNOWN_NODES set: TSTypeParameterInstantiation.

Without fully understanding the inner workings of the indent rule, I simply added this missing node type to the set; and sure enough it seems to have fixed the false positive.

I've added test cases for the valid code samples and confirmed that the tests still pass; but I'm unsure of any other impact from adding this additional node type to the set of known nodes.

[bradzacher]

LGTM