chore(cubesql): Remove usage of nightly features

[ovr]

This PR unblocks an ability to upgrade rust to stable 1.84.1. I am going to do the rust upgrade in the separate PR - #9222

Usage of thiserror crate was removed for two error structures (ProtocolError from pg-srv and CompilationError from cubesql), because using Backtrace in errors requires a nightly compiler with Rust version 1.73 or newer. Move it to manual implementation

[codecov]

Codecov Report

Attention: Patch coverage is 70.96774% with 9 lines in your changes missing coverage. Please review.

Project coverage is 83.44%. Comparing base (6483f66) to head (535bb19).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
rust/cubesql/pg-srv/src/lib.rs	61.11%	7 Missing ⚠️
rust/cubesql/cubesql/src/compile/error.rs	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9215      +/-   ##
==========================================
- Coverage   83.44%   83.44%   -0.01%     
==========================================
  Files         227      227              
  Lines       81599    81626      +27     
==========================================
+ Hits        68094    68113      +19     
- Misses      13505    13513       +8     

Flag	Coverage Δ
cubesql	83.44% <70.96%> (-0.01%)	⬇️

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[KSDaemon]

👍🏻 Great!