Make types for capitalize infer format for constant strings

[rafawendel]

This PR improves the types of capitalize on string.ts

Description

Instead of hardcoded string types, I've leveraged generic functions and TS' Capitalize to infer the type for constant strings.

Checklist

• Changes are covered by tests if behavior has been changed or added
• Tests have 100% coverage
• If code changes were made, the version in package.json has been bumped (matching semver)
• If code changes were made, the yarn build command has been run and to update the cdn directory
• If code changes were made, the documentation (in the /docs directory) has been updated

Resolves

If the PR resolves an open issue tag it here. For example, Resolves #34

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Name	Status	Preview	Comments	Updated (UTC)
radash-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 24, 2024 6:36pm

[aleclarson]

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'