Add support for subschema exposers

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Lines Of Code

Language	Files	Lines	Code	Comments	Blanks	Complexity	Bytes
Go	6	1544 (+139)	1087 (+95)	132 (+7)	325 (+37)	431 (+26)	35.6K (+3.1K)
Go (test)	11 (+1)	1780 (+155)	1302 (+114)	213 (+18)	265 (+23)	43 (+4)	45.7K (+3.7K)
Markdown	1	101 (+9)	81 (+8)	0	20 (+1)	0	5.4K (+954B)

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Unit Test Coverage

total: (statements) 74.5%

Coverage diff with base branch

```diff 66c66 < github.com/swaggest/jsonschema-go/entities.go WithIf 0.0% --- > github.com/swaggest/jsonschema-go/entities.go WithIf 100.0% 68c68 < github.com/swaggest/jsonschema-go/entities.go WithThen 0.0% --- > github.com/swaggest/jsonschema-go/entities.go WithThen 100.0% 70c70 < github.com/swaggest/jsonschema-go/entities.go WithElse 0.0% --- > github.com/swaggest/jsonschema-go/entities.go WithElse 100.0% 75c75 < github.com/swaggest/jsonschema-go/entities.go WithNot 0.0% --- > github.com/swaggest/jsonschema-go/entities.go WithNot 100.0% 123c123,124 < github.com/swaggest/jsonschema-go/reflect.go reflect 94.5% --- > github.com/swaggest/jsonschema-go/reflect.go reflect 92.9% > github.com/swaggest/jsonschema-go/reflect.go applySubSchemas 86.8% 135c136 < total: (statements) 72.8% --- > total: (statements) 74.5% ```

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Go API Changes

# github.com/swaggest/jsonschema-go
## compatible changes
AllOfExposer: added
AnyOfExposer: added
ElseExposer: added
ErrSkipProperty: added
IfExposer: added
NotExposer: added
OneOfExposer: added
StripDefinitionNamePrefix: added
ThenExposer: added

# summary
Inferred base version: v0.3.24
Suggested version: v0.4.0

[codecov[bot]]

Codecov Report

Merging #32 (c66b952) into master (21e54e7) will increase coverage by 0.91%. The diff coverage is 67.92%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   67.22%   68.14%   +0.91%     
==========================================
  Files           6        6              
  Lines         897      948      +51     
==========================================
+ Hits          603      646      +43     
  Misses        234      234              
- Partials       60       68       +8     

Flag	Coverage Δ
unittests	68.14% <67.92%> (+0.91%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
helper.go	82.41% <ø> (ø)
reflect.go	74.61% <67.92%> (-0.76%)	:arrow_down:
entities.go	53.65% <0.00%> (+2.43%)	:arrow_up:

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Benchmark Result

Benchmark diff with base branch

``` name old time/op new time/op delta Schema_UnmarshalJSON_raw-2 76.3µs ± 3% 76.0µs ± 2% ~ (p=1.000 n=5+5) Schema_UnmarshalJSON-2 590µs ± 3% 595µs ± 7% ~ (p=0.841 n=5+5) Schema_MarshalJSON_raw-2 74.0µs ± 2% 77.2µs ± 4% ~ (p=0.056 n=5+5) Schema_MarshalJSON-2 225µs ± 2% 227µs ± 2% ~ (p=0.421 n=5+5) name old alloc/op new alloc/op delta Schema_UnmarshalJSON_raw-2 31.7kB ± 0% 31.7kB ± 0% ~ (p=0.333 n=5+5) Schema_UnmarshalJSON-2 180kB ± 0% 180kB ± 0% ~ (p=0.556 n=5+4) Schema_MarshalJSON_raw-2 30.9kB ± 0% 30.9kB ± 0% ~ (p=0.206 n=5+5) Schema_MarshalJSON-2 53.9kB ± 0% 53.9kB ± 0% ~ (p=0.571 n=5+5) name old allocs/op new allocs/op delta Schema_UnmarshalJSON_raw-2 457 ± 0% 457 ± 0% ~ (all equal) Schema_UnmarshalJSON-2 2.00k ± 0% 2.00k ± 0% ~ (all equal) Schema_MarshalJSON_raw-2 554 ± 0% 554 ± 0% ~ (all equal) Schema_MarshalJSON-2 482 ± 0% 482 ± 0% ~ (all equal) ```

Benchmark result

``` name time/op Schema_UnmarshalJSON_raw-2 76.0µs ± 2% Schema_UnmarshalJSON-2 595µs ± 7% Schema_MarshalJSON_raw-2 77.2µs ± 4% Schema_MarshalJSON-2 227µs ± 2% name alloc/op Schema_UnmarshalJSON_raw-2 31.7kB ± 0% Schema_UnmarshalJSON-2 180kB ± 0% Schema_MarshalJSON_raw-2 30.9kB ± 0% Schema_MarshalJSON-2 53.9kB ± 0% name allocs/op Schema_UnmarshalJSON_raw-2 457 ± 0% Schema_UnmarshalJSON-2 2.00k ± 0% Schema_MarshalJSON_raw-2 554 ± 0% Schema_MarshalJSON-2 482 ± 0% ```