feat: support startColumn option

[JLHwung]

Q	A
Fixed Issues?	Resolves #13884
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?	Yes
Tests Added + Pass?	Yes
Documentation PR Link	babel/website#2586
Any Dependency Changes?
License	MIT

This PR implements startColumn option in Babel parser. Like startLine, the startColumn indicates the starting column position of the input string in the source code. For example, consider a wrapper

function (exports, require, module, __filename, __dirname) { [code] }

where [code] is a string from which Babel parser will generate AST. A user will expect the generated location info correctly maps to the location in the wrapped code, in this case, he/she should pass

{
  "startColumn": 60
}

to Babel parser so that the line 1 column 0 at [code] maps to line 1 column 60 in the wrapped source. Not that unlike startLine, the startColumn is 0-based, its default value is 0.

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/49454/

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