contentviews: fix protobuf number encoding

[mhils]

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[Copilot]

Pull Request Overview

This PR fixes Protobuf number encoding in contentviews by improving YAML prettification and re-encoding logic to properly handle and represent various numeric types (including signed numbers via ZigZag encoding).

• Introduces a helper struct (NumReprs) to collect multiple numeric representations and select the best one for output.
• Adds a new static tag ZIGZAG for signed integer (sint) handling and updates tests accordingly.
• Refactors re-encoding functions to better convert numeric values for FIXED32, FIXED64, and varint fields.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
mitmproxy-contentviews/src/protobuf/yaml_to_pretty.rs	Implements NumReprs for formatted number representation and comments.
mitmproxy-contentviews/src/protobuf/view_protobuf.rs	Adds new ZIGZAG tag and updates tests to reflect new output formats.
mitmproxy-contentviews/src/protobuf/view_grpc.rs	Adjusts test expectations for gRPC YAML output.
mitmproxy-contentviews/src/protobuf/reencode.rs	Refactors numeric parsing and conversion, including ZigZag encoding.
mitmproxy-contentviews/src/protobuf/proto_to_yaml.rs	Modifies tag_number to conditionally tag unknown fields by type.