[#7] Add local tool for building database file

Added frostfs-locode-db CLI utility that can generate and view UN/LOCODE
database files. Go package
git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/locode copied to
this repository to eliminate interdependency between frostfs-node and
frostfs-locode-db projects. The process of building database files
reduced to starting make command.

Signed-off-by: George Bartolomey <george@bh4.ru>

pkg/locode/db/point_test.go

@@ -0,0 +1,51 @@
+package locodedb
+
+import (
+	"testing"
+
+	locodecolumn "git.frostfs.info/TrueCloudLab/frostfs-locode-db/pkg/locode/column"
+	"github.com/stretchr/testify/require"
+)
+
+func TestPointFromCoordinates(t *testing.T) {
+	testCases := []struct {
+		latGot, longGot   string
+		latWant, longWant float64
+	}{
+		{
+			latGot:   "5915N",
+			longGot:  "01806E",
+			latWant:  59.25,
+			longWant: 18.10,
+		},
+		{
+			latGot:   "1000N",
+			longGot:  "02030E",
+			latWant:  10.00,
+			longWant: 20.50,
+		},
+		{
+			latGot:   "0145S",
+			longGot:  "03512W",
+			latWant:  -01.75,
+			longWant: -35.20,
+		},
+	}
+
+	var (
+		crd   *locodecolumn.Coordinates
+		point *Point
+		err   error
+	)
+
+	for _, test := range testCases {
+		crd, err = locodecolumn.CoordinatesFromString(test.latGot + " " + test.longGot)
+		require.NoError(t, err)
+
+		point, err = PointFromCoordinates(crd)
+		require.NoError(t, err)
+
+		require.Equal(t, test.latWant, point.Latitude())
+		require.Equal(t, test.longWant, point.Longitude())
+	}
+}