Refactored pgp_pubkey.ts file

[michael-volynets]

Issue #2239
Time Spent: 1h

[tomholub]

It really is messy, but that's not your fault. I'll need to refactor it myself, I think.

[tomholub]

Refactor public_key.ts to expect several several pubkey with several emails

• expect possibly several public keys contained, render them all
• expect that each public key possibly contains several emails, render each
• each pubkey should have import for all emails button as well (if > 1 email)
• on top should be import all public keys button (if > 1 public key)