Add ability to reveal wallet password on unlock

[StephenHeaps]

Description:

We should add a button/toggle to show/hide password

ref: https://bravesoftware.slack.com/archives/C023VS4HJ6Q/p1666185103959729 ref #2: https://bravesoftware.slack.com/archives/C023VS4HJ6Q/p1695925899009109?thread_ts=1695912331.946559&cid=C023VS4HJ6Q

https://www.figma.com/file/oXIiv45pIhF2RGlpEjOfUg/Wallet-onboarding?type=design&node-id=6234%3A45645&mode=design&t=WgEPNGFw5QmUuWZ1-1

[hffvld]

Verified on iPhone 14 and iPad Air using version(s):

Device/OS: iPhone 14 [iOS 16.4.1] and iPad Air [iPadOS 16.4.1]
Version: 1.51 (23.5.8.16) 
BraveCore: 1.51.110 (113.0.5672.77)

Filed follow-up issue #7416

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3rd-party keyboard - FAIL

PRECONDITIONS:

• Install a 3rd-party keyboard, for example, Gboard

STEPS:

Create Wallet

1. Launch Brave > Three dot Menu > Wallet
2. Get Started > Tap in the Password field > Verify that Apple keyboard is shown
3. Tap and hold Globus thumbnail > Verify there is no option to show Gboard
4. Verify the same for the Verify password field

Unlock

1. Launch Brave > Three dot Menu > Wallet
2. Tap in the Password field > Verify that Apple keyboard is showing
3. Tap and hold Globus thumbnail > Verify there is no option to show Gboard

Restore

1. Launch Brave > Three dot Menu > Wallet
2. Tap Restore Tap in the Recovery Phrase field > Verify that Apple keyboard is showing
3. Tap and hold Globus thumbnail > Verify there is no option to show Gboard
4. Repeat the same for the Password and Verify password text fields

ACTUAL RESULTS:

• Verified that 3rd-party keyboard is not shown for the text fields on the Create (setup new wallet), Unlock and Restore screens

1	2	3

Password reveal/hide - PASS

STEPS:

1. Launch Brave > Three dot Menu > Wallet
2. Get Started > Tap in the Password field > Type password > Tap Eye thumbnail > Verify
3. Repeat the same for the Verify password text field

ACTUAL RESULTS:

• Verified that the password is revealed when the Eye thumbnail is tapped, and hidden when the Crossed-eye thumbnail is tapped

https://user-images.githubusercontent.com/128532965/236957191-bcf1eaa3-afcd-47af-9798-ccaac8163394.mov

Biometric unlock - PASS

STEPS:

1. Launch Brave > Three dot Menu > Wallet
2. Use Biometric unlock > Verify

ACTUAL RESULTS:

• Verified that auto-filling password via biometrics is hiding/masking the password before auto-filling it.

https://user-images.githubusercontent.com/128532965/236957942-fc95a1f7-4803-43ef-b541-256982cdc26e.mov

[hffvld]

Filed follow-up issue https://github.com/brave/brave-ios/issues/7416