fix: export param types from firebase-functions/params

[taeold]

Export SecretParam, JsonSecretParam, StringParam, BooleanParam, IntParam, ListParam, and Param types to allow users to import them for type annotations.

Fixes #1777

[gemini-code-assist]

Summary of Changes

Hello @taeold, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the developer experience for Firebase Functions users by making essential parameter types publicly accessible. By exporting types such as SecretParam and StringParam, developers can now leverage TypeScript's full potential for type safety and clarity when defining and interacting with function parameters, resolving a long-standing request from the community.

Highlights

• Type Export: The pull request exports several parameter types, including Param, SecretParam, JsonSecretParam, StringParam, BooleanParam, IntParam, and ListParam, from the firebase-functions/params module.
• Improved Type Annotations: This change allows users to import these types directly, enabling more robust and explicit type annotations in their Firebase Functions code.
• Issue Resolution: The modification directly addresses and fixes issue SecretParam and other param types not exported from firebase-functions/params in v7.0.0 #1777, which requested the ability to import these specific parameter types.

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[gemini-code-assist]

Code Review

This pull request exports several parameter types from firebase-functions/params to make them available for user type annotations, which is a useful addition. The implementation is correct. I've added one comment with a suggestion to merge the new export type statement with an existing one for better code style and consistency.