fix: possible infinite loop when parsing option

[alexander-fenster]

The while loop in parseOptionValue can be infinite if the closing brace } it expects never comes.

const protobuf = require('protobufjs');
protobuf.parse("option (foo).whatever = {");

Reported by @oetr.

Minor unrelated changes also in this PR, because I'm too lazy to create a separate one:

• changed eslint-disable-line to a proper eslint-disable-next-line in a few places to fix linting errors;
• removed extra logging in one of the tests.