Account auto-complete

[sohrab-]

Account fields should offer auto-complete, for example searching for:

• Common programs
• Common sysvars
• Common markets
• Etc.

Some notes:

• This should not prevent the user from still just putting in their own accounts.
• If a specific account type is chosen, should that filter out irrelevant suggestions?
• Accounts should know their type and update that in the transaction, e.g. if you choose system program, the account type should be set to "program"
• https://github.com/anubra266/choc-autocomplete

[sohrab-]

Basic functionality has been implemented.

We need to add more content to the suggestion list:

• Top token mints
• Common market accounts
• Validators
• Etc.