Complete remaining Python binding object support

[adrianweidig]

Summary

Complete the remaining Python object-model work tracked in #2:

• expose record_entry.name_to_id_map_entry as a typed Python object with type, numeric/string name, and GUID accessors
• expose record_entry.multi_value as a typed Python object with raw, typed, integer, datetime, string, binary-data, and GUID accessors
• return a dedicated message_store type from file.message_store
• return a dedicated task type for task and task-request items
• finish the existing recipients placeholder with recipient count, indexed lookup, and sequence access
• register the new types in the module and in both Automake and Visual Studio build manifests
• add type and integration tests

Context

#164 was closed as a duplicate because the Python bindings are not considered ready. The maintainer pointed to #2, whose remaining unchecked items are the scope of this change. This PR intentionally does not alter the PyPI publishing workflow; it addresses the stated binding-readiness prerequisite instead.

Verification

• python -m compileall -q tests
• Visual Studio project parses as valid XML
• git diff --check (with cr-at-eol for the repository's CRLF .vcproj)
• full native and wheel matrices: pending GitHub Actions

The PR is a draft until the upstream native/wheel checks have completed.

[joachimmetz]

Thanks for the proposed changes. Note that there are many competing priorities on my plate at the moment, will take a closer look as soon as time permits.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.22%. Comparing base (e9b304c) to head (2a372e2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
+ Coverage   29.20%   29.22%   +0.02%     
==========================================
  Files          64       64              
  Lines       20854    20791      -63     
  Branches     5037     5037              
==========================================
- Hits         6090     6076      -14     
+ Misses      12818    12769      -49     
  Partials     1946     1946              

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