Reduce impact of Text(Un)Marshaler on schema processing

[vearutop]

Fixes #64.

Now implementing a pair of TextMarshaler/TextUnmarshaler would add string type to schema, but would allow further processing and configuration (it would stop at {"type":"string"} before).

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Lines Of Code

Language	Files	Lines	Code	Comments	Blanks	Complexity	Bytes
Go	6	1897 (-2)	1289 (-1)	217	391 (-1)	505	46K (-15B)
Go (test)	11	2529 (+34)	1809 (+25)	280	440 (+9)	45	63.8K (+686B)

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Unit Test Coverage

total: (statements) 78.8% changed lines: (statements) 100.0%

Coverage of changed lines

| File | Function | Coverage | |----------------|----------|----------| | Total | | 100.0% | | reflect.go | | 100.0% | | reflect.go:335 | reflect | 100.0% |

Coverage diff with base branch

| File | Function | Base Coverage | Current Coverage | |----------------------------------------------|------------|---------------|------------------| | Total | | 78.6% | 78.8% (+0.2%) | | github.com/swaggest/jsonschema-go/helper.go | AddType | 85.7% | 92.9% (+7.2%) | | github.com/swaggest/jsonschema-go/reflect.go | kindSwitch | 87.8% | 90.2% (+2.4%) | | github.com/swaggest/jsonschema-go/reflect.go | reflect | 96.5% | 96.6% (+0.1%) |

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Go API Changes

# summary
Inferred base version: v0.3.43
Suggested version: v0.3.44

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Benchmark Result

Benchmark diff with base branch

``` name old time/op new time/op delta Schema_UnmarshalJSON_raw-2 73.2µs ± 0% 73.5µs ± 1% ~ (p=0.126 n=6+5) Schema_UnmarshalJSON-2 596µs ± 1% 597µs ± 1% ~ (p=0.699 n=6+6) Schema_MarshalJSON_raw-2 72.2µs ± 1% 71.6µs ± 0% ~ (p=0.065 n=6+6) Schema_MarshalJSON-2 242µs ± 0% 244µs ± 1% +0.60% (p=0.015 n=6+6) name old alloc/op new alloc/op delta Schema_UnmarshalJSON_raw-2 31.7kB ± 0% 31.7kB ± 0% ~ (p=0.835 n=6+6) Schema_UnmarshalJSON-2 184kB ± 0% 184kB ± 0% ~ (p=0.545 n=6+5) Schema_MarshalJSON_raw-2 21.9kB ± 0% 21.9kB ± 0% ~ (all equal) Schema_MarshalJSON-2 55.3kB ± 0% 55.3kB ± 0% ~ (p=0.325 n=6+6) 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-2 484 ± 0% 484 ± 0% ~ (all equal) Schema_MarshalJSON-2 477 ± 0% 477 ± 0% ~ (all equal) ```

Benchmark result

``` name time/op Schema_UnmarshalJSON_raw-2 73.5µs ± 1% Schema_UnmarshalJSON-2 597µs ± 1% Schema_MarshalJSON_raw-2 71.6µs ± 0% Schema_MarshalJSON-2 244µs ± 1% name alloc/op Schema_UnmarshalJSON_raw-2 31.7kB ± 0% Schema_UnmarshalJSON-2 184kB ± 0% Schema_MarshalJSON_raw-2 21.9kB ± 0% Schema_MarshalJSON-2 55.3kB ± 0% name allocs/op Schema_UnmarshalJSON_raw-2 457 ± 0% Schema_UnmarshalJSON-2 2.00k ± 0% Schema_MarshalJSON_raw-2 484 ± 0% Schema_MarshalJSON-2 477 ± 0% ```