Add adyen-web package.json to exports

[gareth-canva]

Summary

It's not an uncommon pattern for bundlers/tools to do require.resolve(path.join('@adyen/adyen-web', 'package.json')) in order to find the location of a package's package.json file. However, for packages that have adopted the exports field in their package.json, this pattern won't work unless package.json itself is listed as an 'exported'/accessible file for the module. Here are some related discussions around this pattern: nodejs/node#33460 and nodejs/node#49445

A similar issue arose and was fixed by #837 for the CSS bundle in adyen-web.

This change allows the above pattern using require.resolve to work for @adyen/adyen-web.

@marcperez since you fixed the exports issue for the CSS bundle previously.

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[marcperez]

Hi @gareth-canva,

Thanks for the PR! Looks good to me.
Out of curiosity, did you encounter this issue with any particular tool or bundler?

[gareth-canva]

Thanks for the quick turnaround @marcperez. The tooling I ran into this issue with was internal, so nothing to worry too much about in this particular instance.

[marcperez]

Good to know anyway! Thanks for your contribution! 👍