fix: missing functions in Source Native variants

[shenyih0ng]

Fixes #1429

Description

Currently, when a user references certain functions in Source Native variants a <identifier> not undeclared error will be raised. These functions are mostly from the list and stream libraries.

The error occurs due to a bug in the runtime context of Source Native variants where functions from libraries are not properly keep tracked of. More specifically, the context only kept track of builtin functions and not those that injected via library preludes. This results in a failed check for undefined variables during the transpilation stage which raised the <identifier> not undeclared error back to the frontend.

The fix

• Keep track of prelude identifier during first run of a Source Native context
• Add previously declared identifier to the context after each run

[coveralls]

Pull Request Test Coverage Report for Build 5430377185

• 5 of 5 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 83.504%

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Totals
Change from base Build 5387187177:	0.03%
Covered Lines:	10624
Relevant Lines:	12313

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💛 - Coveralls

[martin-henz]

Looks good!