fix(core): don't create PDB files when debug=false

[mcpolo99]

Fixes #16

Cherry-pick of mkaring#532 — applies all code-level changes from the upstream PR:

Summary

• Skip PDB creation when debug=false: Adds early return in the Debug phase of ConfuserEngine when context.Project.Debug is false, preventing unnecessary PDB file generation
• Remove hardening instruction count limit: Removes the > 150 instruction count skip in HardeningPhase, allowing all protection helper methods to be inlined into .cctor regardless of size
• Pin decrypted bytes with GCHandle: Uses GCHandle.Alloc with GCHandleType.Pinned in both Compressor and CompressorCompat to prevent GC from relocating decrypted assembly bytes during Assembly.Load/LoadModule, then properly frees the handle after use

Test plan

• Build the solution and verify no compilation errors
• Run ConfuserEx with debug=false and confirm no .pdb files are created in output
• Run ConfuserEx with debug=true and confirm .pdb files are still created
• Test with packer protection enabled to verify Compressor GCHandle changes work correctly
• Test hardening protection with methods larger than 150 instructions

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