Add a way to opt-out of cosmiconfig

[Timer]

🚀 Feature Proposal

Create React App uses svgr and we'd like a way to disable the ability to configure the tool via any/all means (mostly via cosmiconfig).
Configuration was not present in v1 and is preventing us from moving to v2. 😄

Motivation

Create React App likes to provide sensible defaults that just work, never requiring the user gain an understanding of what lies underneath.

Example

Add an option to the webpack loader / related packages to disable cosmiconfig for svgr & svgo, relying only on the options provided via the API.

[TrySound]

I can't find a place where webpack loader uses external config. Are you sure this feature exists?
https://github.com/smooth-code/svgr/blob/master/packages/webpack/src/index.js
https://github.com/smooth-code/svgr/blob/master/packages/core/src/convert.js

[Timer]

Svgo is invoked here:
https://github.com/smooth-code/svgr/blob/8683967eba69079e1ce0fde9de340a6bb16cf433/packages/core/src/convert.js#L1
https://github.com/smooth-code/svgr/blob/8683967eba69079e1ce0fde9de340a6bb16cf433/packages/core/src/convert.js#L14

This method loads configuration off disk with no way to prevent it:
https://github.com/smooth-code/svgr/blob/8683967eba69079e1ce0fde9de340a6bb16cf433/packages/core/src/plugins/svgo.js#L24-L30

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convert's state field is hard coded so I can't trick it with a fake filePath:
https://github.com/smooth-code/svgr/blob/8683967eba69079e1ce0fde9de340a6bb16cf433/packages/webpack/src/index.js#L42

[gregberge]

Follow up #192.