Fix ? and ?? operators with array predicate on LHS

[uw4]

Upstream changes ported: jsonata-js/jsonata#774 jsonata-js/jsonata#780

Requires deep clone of (parts of) the AST, thus had to make it serializable to be able to mimic the JS solution with JSON.parse+stringify

Fixes the new operator unit tests from upstream jsonata

[github-actions]

Test Results

1 748 tests  ±0   1 745 ✅ ±0   5s ⏱️ -1s
  120 suites ±0       3 💤 ±0 
  120 files   ±0       0 ❌ ±0 

Results for commit c6e6822. ± Comparison against base commit fbb6878.

[uw4]

Notes after review:

• The fixes require to deep clone (part of) the AST. Goal was to not introduce an additional lib dependency (if possible)

• JSON output requires a third party lib

• XML requires 3rd party lib, or using the BeanSerializer which would require to beanify all objects (lots of boilerplate)

• Serialization is natural choice

Serialization for deep clone:

• Required only marking the class(es) with the Serializable interface, then we could use existing Parser.clone
• Adding Serializable interface to classes is bytecode compatible and source compatible.
• Objects are considered internal, and should not be persisted, thus no versioning with serialVersionUID
• Performance is OK
  Size in bytes per clone ~20KB, speed is >3000 clone ops per second (on dev notebook, measured with the new test cases)
  This shouldn't be measurable for most use cases, given that clones are only triggered whenever an operator is parsed