Tracepoint decoding

This crate provides support for decoding data from Linux Tracepoints. This includes support for parsing the event record, parsing tracefs-style format files, parsing EventHeader-style decoding information, extracting fields from the event record, converting field data to Rust types, and converting field data to strings.

Core types:

• PerfItemValue represents the data from a field of a tracepoint event. It has strong type information and includes helpers for converting the field value to a Rust type and formatting the field value as a string.
• PerfEventFormat and PerfFieldFormat support parsing a tracefs-style format file. They include helpers for extracting PerfItemValue field values from a tracepoint event record.
• EventHeaderEnumerator supports parsing an EventHeader-style event.

This crate does not directly interact with any data sources, e.g. it does not consume from trace buffers or perf.data files. Instead, a data source implementation is expected to expose event data and metadata to the consumer using types from this crate (e.g. PerfEventBytes, PerfNonSampleEventInfo, PerfSampleEventInfo), and the consumer can use types from this crate to access event information, access field data, and convert the data to strings.

For example, the tracepoint_perf crate parses perf.data files and exposes the data using the types from this crate.