feat(build): Use gulp for building the lib

Gulpfile.js

@@ -0,0 +1,29 @@
+const ts = require('gulp-typescript');
+const gulp = require('gulp');
+const clean = require('gulp-clean');
+
+const { join } = require('path');
+
+const DIST = join(__dirname, 'dist');
+const LIB = join(__dirname, 'lib');
+
+const terminus = ts.createProject(join(__dirname, 'tsconfig.json'));
+
+gulp.task('clean', () => {
+  return gulp.src(DIST).pipe(clean())
+});
+
+gulp.task('move', () => {
+  return gulp
+    .src(join(LIB, './**/*.proto'), { base: LIB })
+    .pipe(gulp.dest(join(DIST)));
+});
+
+gulp.task('build', () => {
+  return terminus
+    .src()
+    .pipe(terminus())
+    .pipe(gulp.dest(DIST));
+});
+
+gulp.task('default', gulp.series(['clean', 'build', 'move']));