fix(jmespath): refactor custom function introspection to work with minification

[dreamorosi]

Description of your changes

This PR fixes a bug that caused JMESPath custom functions to fail to be detected and throw a runtime error when running on minified functions.

The previous logic relied on the name of the class (via prototype.constructor.name) which caused it to fail when the code is minified since entities are aliased to use shorter names.

The new logic introduced in this PR uses an identity check (value instanceof Class) which minification-proof since even when aliased both classes will still maintain their inheritance.

Related issues, RFCs

Issue number: #2383

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[am29d]

great catch, we might need to inspect other places where we use prototype checks, we might discover more over time.