marshal expressions as json string

[mn13]

Summary by CodeRabbit

• New Features

  • Enhanced JSON serialization for the Expression field in templates, improving compatibility with other components.

• Bug Fixes

  • Improved error handling during JSON marshaling to ensure a valid Template struct is returned even in case of errors.

[coderabbitai[bot]]

📝 Walkthrough

## Walkthrough The changes in this pull request primarily affect the `mapTemplate` function in the `precompiles/act/types.go` file. The modifications include updating the serialization of the `Expression` field in the `Template` struct to use JSON marshaling instead of a direct string conversion. Additionally, the error handling during the marshaling process has been improved to ensure that a valid `Template` struct is returned even if an error occurs. ## Changes | File | Change Summary | |-------------------------------|-----------------------------------------------------------------------------------------------------------------| | precompiles/act/types.go | Updated `mapTemplate` function to use JSON marshaling for the `Expression` field and improved error handling. | ## Sequence Diagram(s) ```mermaid sequenceDiagram participant Caller participant mapTemplate participant JSON Caller->>mapTemplate: Call with Template mapTemplate->>JSON: Marshal Expression alt Success JSON-->>mapTemplate: Return JSON string else Error JSON-->>mapTemplate: Return error end mapTemplate-->>Caller: Return Template (valid) ```

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[github-actions[bot]]

Hey @mn13 and thank you for opening this pull request! 👋🏼

It looks like you forgot to add a changelog entry for your changes. Make sure to add a changelog entry in the 'CHANGELOG.md' file.