refactor(core): clear uri_scheme_protocol registration function names

[lucasfernog]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• New Binding Issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes. Issue #___
• No

The PR fulfills these requirements:

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If adding a new feature, the PR's description includes:

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Other information:

The current custom_protocol registration functions names will be confusing when we add deeeplink supports. This PR renames it to register_webview_protocol to be explicit. Related to #1553