Slice Enhancements and Struct Comparison Fixes

This release introduces the `find()` function for Go slices, improves struct handling by disallowing `==` comparison for custom structs, and includes a few test improvements.

Struct As Map

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make from nil

Update for Latest Go 1.18 SL: google/starlark-go@f864706

More Custom Tags Usage

Go 1.18 for Latest Go-Starlark

Fix Latest Go-Starlark: google/starlark-go@12f4cb8

Enhancements and Fixes in Struct Handling and Time Support

This release includes several important updates and fixes:

1. Refactored common utility into a single file for the convert package. This change improves code organization and maintainability (#19).
2. Fixed a critical issue that could cause stack overflow panics due to infinite recursion. The system now properly detects such scenarios and avoids them (#18).
3. Fixed the handling of custom tags for nested structs. This fix ensures accurate and reliable struct processing (#17).
4. Introduced the ability to make lists, tuples, and sets. This feature expands the flexibility and functionality of the system (#16).
5. Added support for the standard library time from go.starlark.net/lib/time. This feature allows users to work with time more effectively in their applications (#15).

Fix Custom Tag for Struct