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）

codecs/BWC.js

@@ -0,0 +1,42 @@
+/*
+ === BWC - Bearing & Distance to Waypoint - Great Circle ===
+ ------------------------------------------------------------------------------
+ 12
+ 1         2       3 4        5 6   7 8   9 10  11|    13 14
+ |         |       | |        | |   | |   | |   | |    |   |
+ $--BEC,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x.x,T,x.x,M,x.x,N,c--c,m,*hh<CR><LF>
+ ------------------------------------------------------------------------------
+ Field Number:
+ 1. UTCTime
+ 2. Waypoint Latitude
+ 3. N = North, S = South
+ 4. Waypoint Longitude
+ 5. E = East, W = West
+ 6. Bearing, True
+ 7. T = True
+ 8. Bearing, Magnetic
+ 9. M = Magnetic
+ 10. Nautical Miles
+ 11. N = Nautical Miles
+ 12. Waypoint ID
+ 13. FAA mode indicator (NMEA 2.3 and later, optional)
+ 14. Checksum
+ */
+
+exports.ID = 'BWC';
+exports.TYPE = '2waypoint';
+
+exports.decode = function(fields) {
+  return {
+    sentence: exports.ID,
+    type: exports.TYPE,
+    lat: +fields[2],
+    latPole: fields[3],
+    lon: +fields[4],
+    lonPole: fields[5],
+    bearingtrue: +fields[6],
+    bearingmag: +fields[8],
+    distance: +fields[10],
+    id: fields[12]
+  }
+}