Add workEmail on membership table and ask user to provide one during invitation accept process.

[dahal]

• This PR fix: improve stakeholder invite flow #94 is going to improve current invite flow.
• Lets add workEmail field to membership table.
• Ask user to provide that workEmail when they accept invitation, on verification page.

[linear]

CAP-41 Add workEmail on membership table and ask user to provide one during invitation accept process.

[G3root]

Should we include workName and show it as the main name? This way, an admin can change a membership's name without changing the user's name, even if they belong to other companies too.

[dahal]

Should we include workName and show it as the main name? This way, an admin can change a membership's name without changing the user's name, even if they belong to other companies too.

We dont need workName atm, we assume User#name will be a legal name. @G3root