fix: do not lookup sentry-debug-meta but instead load it directly

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

fix: do not lookup sentry-debug-meta but instead loads it directly

💡 Motivation and Context

probably fixes #442
one may have thousands of asset files and this will slow down the startup time.
instead of looking up if the sentry-debug-meta exists, we try to load it directly and take care of FileNotFoundException.
the downside is: if one doesn't have asset files, catching the exception might be more expensive than the looking up itself, but worth it.

💚 How did you test it?

running it, tests are in place.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps

ideally sentry-debug-meta.properties will be a manifest config or SentryOptions, as a file this is suboptimal, but needed because of retro compatibility.

[philipphofmann]

All minor comments except for two important ones.
Good bet with just opening the asset and not checking if it exists. I guess the downside with catching the exception is not going to slow us down that much. I think it is a good tradeoff.

[bruno-garcia]

LGTM