Add capability to evaluate field-level type checks

[albertlockett]

Change Summary

Part 2 of what was started in #2754 ...

Adds the capability to OPL and the OTAP query-engine to evaluate logical expressions that check the type of some field. For example:

logs | where attributes["x"] is String
logs | where attributes["y"] is Integer

This i useful for cases where users may wish to do something with a field of unknown type (an AnyValue) and the operation would fail if the value was not the correct type. For example, maybe I wish to redact log body only if it is text, when I know that sometimes the body will actually be an int:

logs | if (body is String) {
  set body = concat(substring(body, 0, 3), "****") // <-- substring only accepts string type
}

In this case we use the GetType expression which is only supposed to return a value from the ValueType enum (see discussion here: #2754 (comment)), so currently only these values are supported. Although there are in fact many other types supported by OTel (e.g. specific int types like uint32, some etc.) the set of types in ValueType seem to be enough for most useful expressions, at least in the context of what the engine currently supports.

What issue does this PR close?

• Closes Support logical expressions that check the type of fields or the stream elements #2752

How are these changes tested?

Unit tests

Are there any user-facing changes?

Yes - this type of expressions is now available in transform processor.

[codecov]

Codecov Report

❌ Patch coverage is 94.00000% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.10%. Comparing base (524b78d) to head (1ec0cac).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2794      +/-   ##
==========================================
+ Coverage   86.09%   86.10%   +0.01%     
==========================================
  Files         694      695       +1     
  Lines      263421   263941     +520     
==========================================
+ Hits       226789   227273     +484     
- Misses      36108    36144      +36     
  Partials      524      524              

Components	Coverage Δ
otap-dataflow	87.07% <96.38%> (+0.02%)	⬆️
query_abstraction	80.61% <ø> (ø)
query_engine	90.73% <41.66%> (-0.04%)	⬇️
otel-arrow-go	52.45% <ø> (ø)
quiver	92.25% <ø> (ø)

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