Add JSON support

[lovetodream]

This introduces a new public type OracleJSON. OracleJSON conforms to OracleDecodable when its Value is Decodable. It conforms to OracleEncodable when its Value conforms to Encodable.

OracleDecodingContext does no longer require a JSONDecoder. It has no public initializer anymore. This is a breaking change affecting everyone who implements custom OracleDecodable or OracleCodable conformances. To resolve the breakage, remove the generic JSONDecoder from OracleDecodingContext:

extension MyType: OracleDecodable {
-   public init<JSONDecoder: OracleJSONDecoder>(
+   public init(
        from buffer: inout ByteBuffer,
        type: OracleDataType,
-       context: OracleDecodingContext<JSONDecoder>
+       context: OracleDecodingContext
    ) throws
}

The same change is made for OracleEncodingContext and its OracleJSONEncoder:

extension MyType: OracleEncodable {
-    public func encode<JSONEncoder: OracleJSONEncoder>(
+    public func encode(
        into buffer: inout ByteBuffer,
-       context: OracleEncodingContext<JSONEncoder>
+       context: OracleEncodingContext
    )
}

[codecov]

Codecov Report

Attention: Patch coverage is 96.93265% with 143 lines in your changes missing coverage. Please review.

Project coverage is 87.06%. Comparing base (2deceb0) to head (d270b05).

Files with missing lines	Patch %	Lines
Sources/OracleNIO/Data/JSON/OracleJSONWriter.swift	92.99%	26 Missing ⚠️
...rces/OracleNIO/Data/JSON/OracleJSON+Encoding.swift	94.94%	22 Missing ⚠️
Sources/OracleNIO/Data/JSON/OracleJSONParser.swift	95.05%	19 Missing ⚠️
Sources/OracleNIO/Data/OracleVector.swift	80.24%	16 Missing ⚠️
...ions/ByteBuffer/ByteBuffer+ThrowingReadBytes.swift	25.00%	15 Missing ⚠️
...ns/ByteBuffer/ByteBuffer+ThrowingReadInteger.swift	52.38%	10 Missing ⚠️
...ons/ByteBuffer/ByteBuffer+ThrowingReadString.swift	50.00%	10 Missing ⚠️
...ources/OracleNIO/Data/JSON/OracleJSONStorage.swift	70.00%	9 Missing ⚠️
...rces/OracleNIO/Data/IntervalDS+OracleCodable.swift	66.66%	6 Missing ⚠️
...rces/OracleNIO/Data/JSON/OracleJSON+Decoding.swift	99.10%	6 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
+ Coverage   81.64%   87.06%   +5.42%     
==========================================
  Files         130      140      +10     
  Lines       14866    19145    +4279     
==========================================
+ Hits        12137    16669    +4532     
+ Misses       2729     2476     -253     

Flag	Coverage Δ
	87.06% <96.93%> (?)

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

Files with missing lines	Coverage Δ
...onnectionStateMachine/ConnectionStateMachine.swift	72.91% <100.00%> (+0.04%)	⬆️
Sources/OracleNIO/Data/Bool+OracleCodable.swift	0.00% <ø> (ø)
...rces/OracleNIO/Data/ByteBuffer+OracleCodable.swift	87.50% <ø> (ø)
Sources/OracleNIO/Data/Bytes+OracleCodable.swift	0.00% <ø> (ø)
Sources/OracleNIO/Data/Cursor.swift	68.96% <ø> (ø)
Sources/OracleNIO/Data/Data+OracleCodable.swift	82.35% <ø> (ø)
Sources/OracleNIO/Data/Date+OracleCodable.swift	93.85% <ø> (ø)
Sources/OracleNIO/Data/Double+OracleCodable.swift	68.62% <ø> (ø)
Sources/OracleNIO/Data/Float+OracleCodable.swift	80.64% <ø> (ø)
Sources/OracleNIO/Data/Int+OracleCodable.swift	19.56% <ø> (ø)
... and 37 more

... and 4 files with indirect coverage changes

[kicsipixel]

Looking forward to testing it, app is ready only JSON support is missing :)