Feat/app env vars (#430)

* initial changes for env var support

* WIP

* Update applications.js

* JSON stringify before encrypting

* use call_hook.url

* env vars working

GET /v1/AppEnv?url=[URL] to trigger options request to URL and return app-schema
POST /v1/Applications with {env_vars: [OBJECT} to create app with env vars
PUT /v1/Applications/[SID] with {env_vars: [OBJECT} to change env vars
GET returns env vars

POST and PUT will also trigger an OPTIONS request to the call_hook url to get schema and then validate the env_vars against it

* update appenv cannot finish request.

* wip

* wip

* wip

* wip

---------

Co-authored-by: Dave Horton <daveh@beachdognet.com>
Co-authored-by: Quan HL <quan.luuhoang8@gmail.com>
Co-authored-by: Hoan Luu Huu <110280845+xquanluu@users.noreply.github.com>

db/jambones-sql.sql

@@ -516,6 +516,7 @@ fallback_speech_synthesis_label VARCHAR(64),
 fallback_speech_recognizer_vendor VARCHAR(64),
 fallback_speech_recognizer_language VARCHAR(64),
 fallback_speech_recognizer_label VARCHAR(64),
+env_vars TEXT,
 created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
 record_all_calls BOOLEAN NOT NULL DEFAULT false,
 PRIMARY KEY (application_sid)
@@ -743,4 +744,4 @@ ALTER TABLE accounts ADD FOREIGN KEY device_calling_application_sid_idxfk (devic
 
 ALTER TABLE accounts ADD FOREIGN KEY siprec_hook_sid_idxfk (siprec_hook_sid) REFERENCES applications (application_sid);
 
-SET FOREIGN_KEY_CHECKS=1;
+SET FOREIGN_KEY_CHECKS=1;