[WIP] Refactor symbol generation and LookupProvider registration logic

[seungsoo47]

This PR introduces the following changes to reduce the loading time of the first API call.

• Refactored symgen to generate separate symbol files for each target library.
• Refactored LookupProvider to enable dynamic symbol registration via registerSymbols method.

Tizen_interop api's loading time was improved by approximately 88% after this change was applied.

API	Before (ms)	After (ms)	Gap
tizen.app_get_name	9.554	1.127	-8.427 (88%)

[JSUYA]

Before going with this pr, I recommend discussing the structure and goals(?).
All code generation for tizen_interop should be automated(using script). Since we don't have a separate guide for DART API (headers ? imports?), we need to discuss how this will be handled. We also need to check if there are any dependencies between generated dart files.

[seungsoo47]

Before going with this pr, I recommend discussing the structure and goals(?). All code generation for tizen_interop should be automated(using script). Since we don't have a separate guide for DART API (headers ? imports?), we need to discuss how this will be handled. We also need to check if there are any dependencies between generated dart files.

Thank you for your comments.
Yes, we need to discuss more for this PR.
And, I think we need to create documents for the DART APIs like Tizen native APIs documents. As you know, we can update the api documents on the SamsungTizenOS site.
Also, I expect there are not any dependencies by this PR changes because this PR only separates tizen symbols.

[JSUYA]

I don't think there's a need to separate symbols.dart anymore.
I think a single generated_symbols.dart file, like before, should be sufficient.

And since the ultimate key point is the _lookupProvider.registerSymbols() call, it seems more efficient to internally manage the list of symbols registered rather than generating all tizen{Modulename} instances. Then, it seems like calls can be made in the existing tizen.{api} format.

What do you think?