Refactor: Structured logging.

[fdcastel]

Another piece of #1196.

The code has been rewritten from the ground up, though I've kept some names and structure, at least for this initial version.

• IFbLogger -> Microsoft.Extensions.Logging.ILogger<T>
• FbLogManager -> Probably better to rename it to FBLoggingConfiguration?
• LogMessages -> Converted to structured logging format.

There are some warnings about libraries not tested with .net5. What about to support .net6 and up with compiler directives?

In .net6 log messages can be generated in compile-time.

[willibrandon]

Here is before and after comparison of Perf benchmark results on my machine.

BenchmarkDotNet=v0.13.2, OS=Windows 11 (10.0.26120.2130)
AMD Ryzen 9 5950X, 1 CPU, 32 logical and 16 physical cores
.NET SDK=9.0.100-rc.2.24474.11
  [Host]  : .NET 8.0.10 (8.0.1024.46610), X64 RyuJIT AVX2
  NuGet   : .NET 6.0.35 (6.0.3524.45918), X64 RyuJIT AVX2
  Project : .NET 6.0.35 (6.0.3524.45918), X64 RyuJIT AVX2

Jit=RyuJit  Platform=X64  Toolchain=.NET 6.0  
WarmupCount=3  

Perf.CommandBenchmark

FirebirdSQL:master (Old) <-> fdcastel:refactor-logs (New)

Diff	Method	Mean	Error	Allocated
Old	Execute	40,075.4 μs	1,450.87 μs	313.71 KB
New		35,615.7 μs (-11%)	1,004.62 μs	313.14 KB (0%)
Old	Execute	34,465.9 μs	680.65 μs	311.3 KB
New		34,424.2 μs (0%)	664.19 μs	333.43 KB (+7%)
Old	Fetch	640.1 μs	11.02 μs	56.88 KB
New		635.3 μs (-1%)	9.72 μs	56.88 KB (0%)
Old	Fetch	653.2 μs	10.90 μs	51.43 KB
New		658.1 μs (+1%)	10.04 μs	51.78 KB (+1%)
Old	Execute	33,690.3 μs	648.64 μs	319.86 KB
New		34,391.7 μs (+2%)	641.87 μs	319.85 KB (0%)
Old	Execute	32,943.5 μs	235.67 μs	317.28 KB
New		33,040.8 μs (0%)	198.62 μs	339.28 KB (+7%)
Old	Fetch	642.2 μs	3.47 μs	60.75 KB
New		644.5 μs (0%)	11.90 μs	60.75 KB (0%)
Old	Fetch	664.2 μs	7.49 μs	55.31 KB
New		654.2 μs (-2%)	9.79 μs	55.65 KB (+1%)

[fdcastel]

Rebase with master.