crypto Cipher/Decipher validation issues

This also affects Decipher methods. Here's an example: ```js const { createCipheriv, randomBytes } = require('crypto'); const cipher = createCipheriv('aes-256-cbc', randomBytes(32), randomBytes(16)); cipher.update('test', 'utf-8', 'bad'); ``` Gives an internal assertion: ``` Error [ERR_INTERNAL_ASSERTION]: Cannot change encoding This is caused by either a bug in Node.js or incorrect usage of Node.js internals. Please open an issue with this stack trace at https://github.com/nodejs/node/issues ``` `final` has the same issue: ```js const { createCipheriv, randomBytes } = require('crypto'); const cipher = createCipheriv('aes-256-cbc', randomBytes(32), randomBytes(16)); cipher.update('test', 'utf-8', 'utf-8'); cipher.final('bad'); ``` Other issue: ```js const { createCipheriv, randomBytes } = require('crypto'); const cipher = createCipheriv('aes-256-cbc', randomBytes(32), randomBytes(16)); let result = cipher.update('test', 'bad', 'hex'); result += cipher.final('hex'); console.log(result); ``` Gives no error at all for the wrong input encoding. @nodejs/crypto