feat: 导入 NMEA-0183 GPS 协议解析库（node-nmea）

NMEA-0183 语句解析器，含 21 个语句类型 codec 与配套单元测试。

- codecs/：APB/BWC/DBT/GGA/GLL/GRMT/GSA/GSV/HDG/HDM/HDT/MWV/RDID/
  RMB/RMC/ROT/RSA/TXT/VTG/VWR/ZDA
- test/：各 codec 对应的 mocha 用例
- .github/workflows/：node与 npm-publish 流水线

许可证：MIT（原作者 James Penn）

README.md

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+A NMEA-0183 GPS Protocol parser
+===============================
+
+An example using the node-serialport library to read a stream of messages
+from a GlobalSat BU-353 USB GPS receiver:
+
+````
+var serialport = require('serialport');
+var nmea = require('nmea');
+
+var port = new serialport.SerialPort('/dev/cu.usbserial', {
+                baudrate: 4800,
+                parser: serialport.parsers.readline('\r\n')});
+    
+port.on('data', function(line) {
+    console.log(nmea.parse(line));
+});
+
+// { type: 'active-satellites',
+//   selectionMode: 'A',
+//   mode: 1,
+//   satellites: [ 29, 18, 21 ],
+//   PDOP: '',
+//   HDOP: '',
+//   VDOP: '',
+//   talker_id: 'GP' }
+// { type: 'satellite-list-partial',
+//   numMsgs: 3,
+//   msgNum: 1,
+//   satsInView: 11,
+//   satellites: 
+//    [ { id: '18', elevationDeg: 7, azimuthTrue: 214, SNRdB: 43 },
+//      { id: '21', elevationDeg: 5, azimuthTrue: 114, SNRdB: 34 },
+//      { id: '26', elevationDeg: 71, azimuthTrue: 234, SNRdB: 0 } ],
+//   talker_id: 'GP' }
+
+````
+
+To add custom codecs
+====================
+````
+var MyCustom = require('./MyCustom.js');
+nmea.traditionalDecoders['MyCustomr'] = MyCustom.decode;
+````
+