own email parsing, without external crate

[Simon-Laux]

the crate we use follows specs which is good, but it is kinda big because it uses the pest parser. also it adds stuff to wasm bindgen that we might not want.

maybe we can take some testcases from them https://github.com/Sayan751/email-address-parser/tree/master/rust-lib/.test_data

[Simon-Laux]

another reason for replacing that crate: it broke my wasm compile and exposed wasm functions without me explicitly enabling it.

[Simon-Laux]

If the simple parsing that we have in #6 is not enough (because of false positives for example) we can do real parsing in #7

[link2xt]

For reference, email-address-parser was removed in 839dc0f

[Simon-Laux]

we could try https://github.com/johnstonskj/rust-email_address