Rust stub: crank clippy linter to pedantic

[robsdedude]

Closes: DRIVERS-256

[Copilot]

Pull request overview

This PR enables the clippy::pedantic linter level for the Rust codebase and addresses all resulting warnings through a combination of refactoring, simplifications, and properly documented allow attributes.

Changes:

• Enabled clippy::pedantic and clippy::allow_attributes_without_reason in main.rs
• Extracted large validator functions into a new jolt_validators module to reduce complexity
• Refactored WebSocket stream state machine by extracting enum variants into separate structs
• Extracted large methods in net_actor.rs into smaller, focused functions
• Added reason parameters to all #[allow(...)] attributes throughout the codebase
• Applied clippy suggestions (simplified matches, if-let-else, map_or, etc.)
• Made visibility changes to support the new module structure

Reviewed changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
boltstub_rs/src/main.rs	Enabled pedantic clippy lints with allow for match_same_arms
boltstub_rs/src/parser.rs	Major refactoring: extracted functions and moved validators to new module
boltstub_rs/src/parser/jolt_validators.rs	New module containing validation logic extracted from parser.rs
boltstub_rs/src/web_socket_stream.rs	Refactored state machine enums into separate structs with extracted methods
boltstub_rs/src/values/pack_stream_value.rs	Added allow reasons and applied clippy simplifications
boltstub_rs/src/net_actor.rs	Extracted large methods into focused helper functions
boltstub_rs/src/bolt_version.rs	Changed message_auto_response return type from Option<Resolvable> to Resolvable
boltstub_rs/src/values/bolt_struct/*.rs	Various clippy fixes and test code cleanup
boltstub_rs/src/net*.rs	Simplified conditionals and added allow reasons
Multiple other files	Minor clippy fixes, allow reasons, and simplifications

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