fix: replace message related to json into JSON type from JSONB (#723)

## Description

This PR intends to fix the issue that message JSON may includes invalid
Unicode sequence \u0000, it would cause the error when saving
transactions and messages into Database.

Reference:
Invalid unicode sequence on PostgreSQL
Jackal transaction including invalid unicode sequence

Related issue: forbole/juno#114

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database/schema/00-cosmos.sql

@@ -43,7 +43,7 @@ CREATE TABLE transaction
     success      BOOLEAN NOT NULL,
 
     /* Body */
-    messages     JSONB   NOT NULL DEFAULT '[]'::JSONB,
+    messages     JSON    NOT NULL DEFAULT '[]'::JSON,
     memo         TEXT,
     signatures   TEXT[]  NOT NULL,
 
@@ -81,7 +81,7 @@ CREATE TABLE message
     transaction_hash            TEXT   NOT NULL,
     index                       BIGINT NOT NULL,
     type                        TEXT   NOT NULL REFERENCES message_type(type),
-    value                       JSONB  NOT NULL,
+    value                       JSON   NOT NULL,
     involved_accounts_addresses TEXT[] NOT NULL,
 
     /* PSQL partition */