Align capitalize with the built-in Capitalize<T> TypeScript type

[aleclarson]

As I mentioned on @rafawendel's Radash PR, the current capitalize differs in behavior from TypeScript's Capitalize<T> built-in type.

The built-in Capitalize type does not match the behavior of Radash capitalize.

type Foo = Capitalize<'foo Bar'>
//   ^? 'Foo Bar'

let foo = _.capitalize('foo Bar')
// => 'Foo bar'

I suggest we change Radashi's capitalize to align with it.

[localusercamp]

Agree. 👍
_.capitalize do not "capitalize" it do "lowercase all and capitalize" which is wierd.

[stefaanMLB]

Agree

[aleclarson]

One downside is we won't be matching Lodash's capitalize. 😕

https://docs-lodash.com/v4/capitalize/

[aleclarson]

We might want to just implement upperFirst instead 🤔

https://docs-lodash.com/v4/upper-first/