Simplify interface for getCellFromLink

[seefeldb]

Now that cell links have spaces, let's simplify the interface for getCellFromLink

@anotherjesse please double check the auth code, specifically that .space should be there because it's generated by Cell.getAsCellLink(). i'm not 100% that's for sure the case (vs hand creating it as { cell: ..., path: ... }).

[anotherjesse]

this is good - cleaning this up would make it better:

    let authCellId = JSON.parse(JSON.stringify(this.auth, null, 2));
    authCellId.space = this.auth?.getAsCellLink().cell.space;
    authCellId = JSON.stringify(authCellId);

[anotherjesse]

also why do we have 3 ways to do this:

a.getAsCellLink()
{space: 'did:key:z6MkvnH7NjbUnNrhKPwrNe2fzZJDsATcduWhwaGZG8WsocXX', cell: {…}, path: Array(2)}
a.toJSON()
{cell: {…}, path: Array(2)}
a.cellLink
{space: 'did:key:z6MkvnH7NjbUnNrhKPwrNe2fzZJDsATcduWhwaGZG8WsocXX', cell: {…}, path: Array(2)}

[anotherjesse]

if you do:

- advanced - gmail import

then click "authenticate" - you can breakpoint here and see we don't get the space in the cell link

[anotherjesse]

@seefeldb I'm going to merge this for now - as it does work and cleans up half of the code