fix(input): match medium size for ionic theme

[thetaPC]

Issue number: internal

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What is the current behavior?

There is only one size, large, for ionic theme. Developers can also leave it undefined and no styles will be applied.

What is the new behavior?

• The medium size has been added. It's also being used as the default.
• Tests have been added.
• Target area has been added.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Other information

Verify that interactive elements can be accessed in the start and end slots along with the clear icon button.

Preview

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Name	Status	Preview	Comments	Updated (UTC)
ionic-framework	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 29, 2024 9:35pm

[liamdebeasi]

Sean approved this, so going to remove myself from review. Let me know if you'd still like me to take a look though!