feat($interpolate): extend interpolation with MessageFormat like syntax

For more detailed information refer to this document:
https://docs.google.com/a/google.com/document/d/1pbtW2yvtmFBikfRrJd8VAsabiFkKezmYZ_PbgdjQOVU/edit

**Example:**

```html

{{recipients.length, plural, offset:1
    =0 {You gave no gifts}
    =1 { {{ recipients[0].gender, select,
              male {You gave him a gift.}
              female {You gave her a gift.}
              other {You gave them a gift.}
          }}
       }
    one { {{ recipients[0].gender, select,
              male {You gave him and one other person a gift.}
              female {You gave her and one other person a gift.}
              other {You gave them and one other person a gift.}
          }}
       }
    other {You gave {{recipients[0].gender}} and # other people gifts. }
}}
```

This is a SEPARATE module so you MUST include `angular-messageformat.js`
or `angular-messageformat.min.js`.

In addition, your application module should depend on the "ngMessageFormat"
(e.g. angular.module('myApp', ['ngMessageFormat']);)

When you use the `ngMessageFormat`, the $interpolate gets overridden with
a new service that adds the new MessageFormat behavior.

**Syntax differences from MessageFormat:**

- MessageFormat directives are always inside `{{ }}` instead of
  single `{ }`.  This ensures a consistent interpolation syntax (else you
  could interpolate in more than one way and have to pick one based on
  the features availability for that syntax.)
- The first part of such a syntax can be an arbitrary Angular
  expression instead of a single identifier.
- You can nest them as deep as you want.  As mentioned earlier, you
  would use `{{ }}` to start the nested interpolation that may optionally
  include select/plural extensions.
- Only `select` and `plural` keywords are currently recognized.
- Quoting support is coming in a future commit.
- Positional arguments/placeholders are not supported. They don't make
  sense in Angular templates anyway (they are only helpful when using
  API calls from a programming language.)
- Redefining of the startSymbol (`{{`) and endSymbol (`}}`) used for
  interpolation is not yet supported.

Closes #11152