[APPSEC-55194] Handle low-level libddwaf exceptions

[Strech]

What does this PR do?

Wrap Processor::Context#run with an error handling and telemetry reporting.

Motivation:

Is some specific situations, our libddwaf-rb is going to throw an exception when it fails to convert C-object into Ruby-object and some other low-level occasions.

Change log entry

Not needed.

Additional Notes:

Likely we would change the interface of libddwaf-rb soon™️, but in foreseen future we need to be able to land on feet when something wrong happen with our FFI binding.

How to test the change?

CI is enough.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-10-29 10:37:16

Comparing candidate commit a1ebf22 in PR branch appsec-55194-handle-low-level-libddwaf-exceptions with baseline commit 7f64645 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 24 metrics, 2 unstable metrics.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.85%. Comparing base (7f64645) to head (a1ebf22).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/datadog/appsec/processor/context.rb	90.90%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4041   +/-   ##
=======================================
  Coverage   97.85%   97.85%           
=======================================
  Files        1321     1321           
  Lines       79318    79331   +13     
  Branches     3904     3905    +1     
=======================================
+ Hits        77620    77633   +13     
  Misses       1698     1698           

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[Strech]

This suppose to be very unfortunate case, we will start with this approach and refactor it next (to report once?)