Remove Axios dependency

[MickL]

Consider removing Axios in favor native fetch. Personally I would recommend to use unjs/ofetch which works in all environments (node, browser, worker).

Motivation:

• Bundle size: In serverless environments, and especially on edge workers, every kb counts and deepl-node is adding another unnecessary library by using Axios
• deepl-node doesnt work on the edge: Axios is not working on non-node environments (without use of fetch adapter), this would resolve Remove Axios dependency #64
• Using fetch, e.g. with ofetch as a wrapper, makes deepl-node work on all Node-like environments like Deno, Bun, Cloudflare Workers, etc.

Possibly with this refactoring a second package could be added that is independent from node, e.g. by removing things like fs. This package could then be used by deepl-node as a base.

[lyqht]

related to this, i kept running into this error too

Error parsing JSON string ConnectionError: Connection failure: timeout of 6448.978271484375ms exceeded
    at Function.sendAxiosRequest (/home/runner/work/_actions/lyqht/deepl-translate-github-action/v2.1.1/node_modules/deepl-node/dist/client.js:163:27)

Assuming minTimeout = 10,000 by default based on the docs, why does this happen?

[AugustinMauroy]

-1 for custom fetch use native fetch