Nested CBOR validation fixes

[anweiss]

Addresses #224

[Copilot]

PR Overview

This pull request addresses issue #224 by refining the nested CBOR validation logic. The key changes include combining conditional branches for range checks in CBOR and JSON validators, adding detailed handling for embedded CBOR values (both as direct byte strings and within arrays), and introducing tests to cover valid and invalid nested CBOR scenarios.

Changes

File	Description
src/validator/cbor.rs	Simplifies conditional checks, refines embedded CBOR decoding for both byte strings and arrays, and adds tests.
src/validator/json.rs	Harmonizes range validation conditions for integer and string values to improve clarity in error handling.

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

src/validator/cbor.rs:1969

• Review the change in tag comparison: the previous cast to u64 ensured type consistency. Verify that removing the cast by using '{ *tag }' does not introduce type mismatches between *tag and *actual_tag.

if { *tag } != *actual_tag {

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