feat: new conversions

[Jay-Karia]

The conversions which are not supported are added.

All possible conversions

	to	Supported	Progress
npm	yarn	✔	✔
npm	pnpm	✔	✔
npm	bun	✔	✔
yarn	npm	✔	✔
yarn	pnpm	❌	✔
yarn	bun	❌	✔
pnpm	npm	❌	❌
pnpm	yarn	❌	❌
pnpm	bun	❌	❌
bun	npm	❌	❌
bun	yarn	❌	❌
bun	pnpm	❌	❌

Closes #40

[armano2]

i was actually thinking about this, and i think this should be done differently

currently we are trying to force conversion from any to any by creating distinct transformers between commands. what i should have done when i added support for (pnpm) transformers is to split it to 2 step process:

1. parse command to internal model
2. write it to desired format

this would make it supper easy to support a lot of different package managers