MINIFICPP-2886 Improve rust api process errors

[martinzink]

I've added a new layer that helps with routing, the process error now contains fatal and rotue errors.
One should use it based on the nature of the error. If its fatal the agent will handle the issue, if its routing error thats technically not an error in the eyes of the agent, we log it route to proper relationship then continue with data processing.

I've changed the errors a bit (schedule, trigger with string literal -> custom) it will already include the errors origin so no need to separate them

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[Copilot]

Pull request overview

Improves Rust processor error handling by separating routable failures from fatal trigger failures and updating processor wrappers and examples accordingly.

Changes:

• Adds ProcessError, RouteError, and routing helpers.
• Updates processor wrappers, attributes, and property definitions.
• Migrates playground processors and tests to the revised API.

Reviewed changes

Copilot reviewed 36 out of 36 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
minifi_native/src/lib.rs	Exports new error and attribute APIs.
c_ffi/c_ffi_processor_definition.rs	Maps process errors to native statuses.
c_ffi/c_ffi_process_session.rs	Preserves callback results during reads.
api/raw_processor.rs	Changes trigger errors to ProcessError.
api/property.rs	Makes property definitions cloneable.
utils/with_attributes.rs	Adds attribute builder methods.
processor_wrappers/utils.rs	Registers the attribute utility module.
flow_file_transform.rs	Adds routable transform failures and builders.
flow_file_stream_transform.rs	Adds routable streaming failures.
flow_file_source.rs	Migrates source processing to ProcessError.
complex_processor.rs	Migrates complex triggers to ProcessError.
api/errors.rs	Defines the revised error model.
component_definition_traits.rs	Replaces property constants with a method.
api/attribute.rs	Adds borrowed output-attribute conversion.
minifi_native_sys/build.rs	Adjusts bindgen C boolean handling.
zoo_processor.rs	Migrates trigger and property APIs.
put_file/processor_definition.rs	Dynamically combines platform properties.
put_file.rs	Uses routable failure errors.
lorem_ipsum_cs_user/processor_definition.rs	Migrates property definitions.
lorem_ipsum_cs_user.rs	Migrates generated FlowFile construction.
log_attribute/processor_definition.rs	Migrates property definitions.
log_attribute.rs	Migrates trigger errors.
kamikaze_processor/tests.rs	Updates error assertions.
kamikaze_processor/processor_definition.rs	Migrates property definitions.
kamikaze_processor.rs	Migrates schedule and trigger errors.
get_file/tests.rs	Updates scheduling error coverage.
get_file/processor_definition.rs	Migrates property definitions.
get_file.rs	Migrates schedule and trigger errors.
generate_flow_file/processor_definition.rs	Migrates property definitions.
generate_flow_file.rs	Migrates trigger errors.
duplicate_text.rs	Migrates streaming transform APIs.
count_actual_logging.rs	Migrates trigger and property APIs.
asciify_german/tests.rs	Updates malformed-input expectations.
asciify_german/processor_definition.rs	Migrates property definitions.
asciify_german.rs	Routes truncated input through ProcessError.
error-handling.feature	Updates expected error log messages.

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