[Android] Add save path to bookmark exported successfully dialog

[timchilds]

Description

Problem: some users are unable to find where we export bookmarks.
https://community.brave.com/t/export-and-import-feature-on-android-app/506777

Solution: show the export path in the dialog. Make it tappable to open folder in default files app (if possible).

[Uni-verse]

Verified on Samsung Galaxy S21 using version:

Brave	1.61.77 Chromium: 119.0.6045.163 (Official Build) beta (64-bit) 
Revision	d0b89bdae9ecff96899c68447dae4a2c45c51e2a
OS	Android 13; Build/TP1A.220624.014; 33; REL

• Ensured that export path is shown in the Export successful message.
• Ensured that confirmation message closes when tapping Close button.
• Ensured that tapping Open folder will open files explorer view.
• Ensured that bookmarks are successfully downloaded to the path location.
• Ensured that selecting Always Open for app selection will successfully export bookmarks next time without the prompt.

Export Flow

Example	Example	Example

Import Flow

Example	Example	Example

Example	Example

[Uni-verse]

Verified on Samsung Galaxy Tab S7 using version:

Brave	1.61.97 Chromium: 120.0.6099.56 (Official Build) (64-bit) 
Revision	06ca6e12ac1f53536386f61c923915da7d128e75
OS	Android 13; Build/TP1A.220624.014; 33; REL

• Ensured that export path is shown in the Export successful message.
• Ensured that confirmation message closes when tapping Close button.
• Ensured that tapping Open folder will open files explorer view.
• Ensured that bookmarks are successfully downloaded to the path location.
• Ensured that selecting Always Open for app selection will successfully export bookmarks next time without the prompt.

Export flow

Example	Example	Example	Example

Import flow

Example	Example	Example	Example

Orientation & Appearance

Landscape	Portrait