fix codes as lintFix and remove deprecated file

work
- fix class-methods-use-this
- remove .eslintrc

Author: skqksh

.babelrc

@@ -1,4 +1,4 @@
 {
-  "presets": ["@babel/preset-env"],
-  "plugins": ["@babel/plugin-external-helpers", "@babel/plugin-transform-runtime"]
+    "presets": ["@babel/preset-env"],
+    "plugins": ["@babel/plugin-external-helpers", "@babel/plugin-transform-runtime"]
 }

.eslintrc

@@ -8,8 +8,8 @@ module.exports = {
     plugins: ['prettier'],
     rules: {
         'prettier/prettier': ['error'],
-        'radix': 0,
-        'eqeqeq': 0,
+        radix: 0,
+        eqeqeq: 0,
         'new-cap': 0,
         'no-empty': 0,
         'no-console': 0,

.eslintrc.js

@@ -12,10 +12,7 @@ class AccountKeyMultiSig {
         if (isDuple(keys)) throw new Error('There is a duplicate key.')
 
         this._keys = keys
-    }
-
-    get type() {
-        return AccountKeyEnum.ACCOUNT_KEY_MULTISIG
+        this.type = AccountKeyEnum.ACCOUNT_KEY_MULTISIG
     }
 
     get defaultKey() {

packages/caver-klay/caver-klay-accounts/src/accountKey/accountKeyMultiSig.js

@@ -6,10 +6,7 @@ class AccountKeyPublic {
 
         if (typeof key !== 'string') throw new Error('To create AccountKeyPublic, a private key strings is required.')
         this._key = key
-    }
-
-    get type() {
-        return AccountKeyEnum.ACCOUNT_KEY_PUBLIC
+        this.type = AccountKeyEnum.ACCOUNT_KEY_PUBLIC
     }
 
     get defaultKey() {

packages/caver-klay/caver-klay-accounts/src/accountKey/accountKeyPublic.js

@@ -14,10 +14,7 @@ class AccountKeyRoleBased {
         this._transactionKey = makeAccountKey(keyObj.transactionKey)
         this._updateKey = makeAccountKey(keyObj.updateKey)
         this._feePayerKey = makeAccountKey(keyObj.feePayerKey)
-    }
-
-    get type() {
-        return AccountKeyEnum.ACCOUNT_KEY_ROLEBASED
+        this.type = AccountKeyEnum.ACCOUNT_KEY_ROLEBASED
     }
 
     get defaultKey() {