Support the "Part 2 of Financial API (FAPI)" for public client.

[daisukenishino]

Requirement

• Support the "Part 2 of Financial API (FAPI)" for public client.
• This should correspond to the following issues.
  • Support the "JAR". #77
  • Support the "OAUTB". #96

Reference

マイクロソフト系技術情報 Wiki

• Financial API (FAPI)
  https://techinfoofmicrosofttech.osscons.jp/index.php?Financial%20API%20%28FAPI%29
  • FAPI Part 2 (Read and Write API Security Profile)
    https://techinfoofmicrosofttech.osscons.jp/index.php?FAPI%20Part%202%20%28Read%20and%20Write%20API%20Security%20Profile%29