Implement resolve, has, and as

[AlexJSully]

This PR includes the following:

• Fix issues with resolve() and improve test coverage #27 by Marwan Tammam (@Quarz0) & integrated by Vicknesh Suresh (@VickSuresh)
• Implement hasValue() and as() functions #30 by Marwan Tammam (@Quarz0) & integrated by Alexander Sullivan (@AlexJSully)
• Go version and packages update by Arthur Pang (@arthurpang)
• Go decimal package update by Joel Phillip (@joelphillip1)
• Update for handling extensions by Bharath Vemula (@bharath-v1)

GitOrigin-RevId: 65cbe989a46576d9ba6ee97a8d3b98a066515888

[alexlaurinmath]