fix(internal): allow serialization of principals to their text values (#901)

This is a non-user visible change.

Author: Hans

src/agent/javascript/src/principal.ts

@@ -61,4 +61,8 @@ export class Principal {
     const matches = result.match(/.{1,5}/g);
     return matches ? matches.join('-') : '';
   }
+
+  public toString() {
+    return this.toText();
+  }
 }

src/bootstrap/types/base32.d.ts

@@ -0,0 +1,23 @@
+declare module 'base32.js' {
+  type Ret = {
+    finalize: () => any;
+  };
+
+  interface DecoderConfig {
+    type?: 'rfc4648' | 'crockford' | 'base32hex';
+    alphabet?: string;
+    lc?: boolean;
+  }
+  class Decoder {
+    constructor(options?: DecoderConfig);
+    write(str: string): this;
+    finalize(str?: string): ArrayBuffer;
+  }
+  class Encoder {
+    private buf: ArrayBuffer;
+    private charmap: { [key: number]: number };
+    constructor(options?: DecoderConfig);
+    write(buf: ArrayBuffer): this;
+    finalize(str?: ArrayBuffer): string;
+  }
+}