Drop BsonClassMap AutoMap

[Turnerj]

Closes #106

IndexModelBuilderBenchmark

Before

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
FlatModel	33.13 us	0.2674 us	0.2502 us	3.7842	-	-	11.59 KB
NestedModel	37.18 us	0.4619 us	0.4094 us	4.9438	-	-	15.15 KB

After

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
FlatModel	32.03 us	0.3295 us	0.2752 us	3.6621	-	-	11.25 KB
NestedModel	35.67 us	0.3898 us	0.3646 us	4.6997	-	-	14.5 KB

EntityMappingBenchmark

Before

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
ResetOverhead	973.1 ns	10.02 ns	9.369 ns	0.2346	-	-	737 B
ClassMapAutoMap	26,108.3 ns	129.99 ns	108.549 ns	2.6550	-	-	8373 B
EntityMappingRegister	98,133.5 ns	1,355.18 ns	1,267.632 ns	12.6953	-	-	40571 B

After

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
ResetOverhead	991.8 ns	8.703 ns	8.141 ns	0.2346	-	-	737 B
ClassMapAutoMap	26,475.4 ns	284.697 ns	266.306 ns	2.6550	-	-	8373 B
EntityMappingRegister	46,178.4 ns	303.181 ns	283.596 ns	9.1553	-	-	28906 B

[codecov]

Codecov Report

Merging #107 into master will increase coverage by 0.24%.
The diff coverage is 96.1%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   91.54%   91.78%   +0.24%     
==========================================
  Files          71       70       -1     
  Lines        2447     2447              
  Branches      322      326       +4     
==========================================
+ Hits         2240     2246       +6     
+ Misses        137      131       -6     
  Partials       70       70

Impacted Files	Coverage Δ
...frastructure/Mapping/EntityDefinitionExtensions.cs	98.71% <100%> (ø)	⬆️
...cture/Mapping/Processors/ExtraElementsProcessor.cs	100% <100%> (ø)	⬆️
.../Mapping/Processors/EntityRelationshipProcessor.cs	95.23% <100%> (-1.06%)	⬇️
...oFramework/Infrastructure/Mapping/EntityMapping.cs	82.89% <100%> (-0.65%)	⬇️
...ework/Infrastructure/Mapping/DefaultMappingPack.cs	100% <100%> (ø)	⬆️
...tructure/Mapping/Processors/NestedTypeProcessor.cs	100% <100%> (ø)	⬆️
...astructure/Mapping/Processors/EntityIdProcessor.cs	93.93% <91.66%> (-2.22%)	⬇️
...ure/Mapping/Processors/PropertyMappingProcessor.cs	97.36% <97.36%> (ø)

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