Add align rule converter + indent merger

[jeremyyap]

PR Checklist

• Addresses an existing issue: fixes Conflict between tslint:align and @typescript-eslint/indent #149
• That issue was marked as status: accepting prs

Overview

The TSLint align converter maps rule arguments to the equivalent options for @typescript-eslint-indent rule supporting the "first" option, which aligns all parameters / arguments / elements / properties with the first one in each declaration.

Next, a merger is required for the @typescript-eslint/indent since two TSLint rules are mapped to it: align and indent.

There is a small issue where the object option cannot be supplied without the indent size option. This is a problem since TSLint's align rule does not concern itself with the indent size. I decided to specify the default indent size of 4 when converting the indent rule. Correspondingly, the indent merger ignores indent size values of 4 when merging rules.

Docs:
TSLint align
@typescript-eslint/indent

[JoshuaKGoldberg]

Huh, really interesting how these defaults work out.

Just ruminating: this PR's change is definitely better than how it is right now, and although there might be some edge case trickiness with the default option of 4, it seems... better to put it out there than to try to shoehorn something else in. I can't think of any other way of dealing with this...

Anyway, thanks @jeremyyap! This looks great 💖