Pull broadcast retry logic into a new RetryingBroadcastHttpHandler class

[saul]

No description provided.

[github-actions]

BenchmarkDotNet v0.13.9+228a464e8be6c580ad9408e98f18813f6407fb5a, Ubuntu 22.04.5 LTS (Jammy Jellyfish)
AMD EPYC 7763, 1 CPU, 4 logical and 2 physical cores
.NET SDK 8.0.403
  [Host]     : .NET 8.0.10 (8.0.1024.46610), X64 RyuJIT AVX2
  Job-TETUMV : .NET 8.0.10 (8.0.1024.46610), X64 RyuJIT AVX2
  Job-FULETV : .NET 8.0.10 (8.0.1024.46610), X64 RyuJIT AVX2

InvocationCount=1  MaxIterationCount=16  UnrollFactor=1  
WarmupCount=1  

Method	Job	BuildConfiguration	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
ParseDemo	Job-TETUMV	Baseline	2.192 s	0.0193 s	0.0171 s	1.00	0.00	5000.0000	1000.0000	516.34 MB	1.00
ParseDemo	Job-FULETV	Default	2.345 s	0.0224 s	0.0210 s	1.07	0.01	5000.0000	1000.0000	516.34 MB	1.00
ParseDemoParallel	Job-TETUMV	Baseline	1.152 s	0.0266 s	0.0236 s	1.00	0.00	6000.0000	1000.0000	558.95 MB	1.00
ParseDemoParallel	Job-FULETV	Default	1.167 s	0.0223 s	0.0186 s	1.01	0.03	6000.0000	1000.0000	558.95 MB	1.00