feat: Add getSize and getSizeWithHeaders support

[AKASHDHARDUBEY]

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Summary:

Explain the motivation for making this change. What existing problem does the pull request solve?

Example: This PR improves cache handling for FastImage by implementing proper invalidation when source URLs change with the same cache key. This solves the issue where stale images would continue to display after content updates.

Changelog:

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[ANDROID|GENERAL|IOS|INTERNAL] [BREAKING|ADDED|CHANGED|DEPRECATED|REMOVED|FIXED|SECURITY] - Message

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• [ANDROID] [FIXED] - Fixed memory leak when rapidly changing FastImage sources

Test Plan:

Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes the user interface.

Example:

• Tested image loading with PNG, JPEG, GIF formats
• Verified cache behavior with FastImage.preload()
• Tested on iOS 14 and Android 10
• Command: cd example && yarn ios/android

[orca-security-in]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[github-actions]

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[devanshsaini11]

@AKASHDHARDUBEY Thanks for raising this PR, can you kindly update PR description

Edit: Lint checks are failing can you fix them