feat(title): add support for small title

[brandyscarney]

✅ Ready to Merge ✅

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: closes #18898

What is the new behavior?

• Adds support for small size in title
• Updates styles on the toolbar / searchbar for iOS 13

master	branch

Does this introduce a breaking change?

• Yes
• No

Other information

Usage information:

<ion-header>
  <ion-toolbar>
    <ion-title size="small">Choose a contact to add to Favorites</ion-title>
  </ion-toolbar>
  <ion-toolbar>
    <ion-title>Contacts</ion-title>
    <ion-buttons slot="end">
      <ion-button>Cancel</ion-button>
    </ion-buttons>
  </ion-toolbar>
  <ion-toolbar>
    <ion-searchbar></ion-searchbar>
  </ion-toolbar>
</ion-header>