feat(router-link): add href and target - backport from Qv2 #10636

[pdanpdan]

If it is disable and type is not 'a' then it must render as button (link cannot be disabled)

If it renders as link ():

• it must not have type (except if type is a MediaType)
• if it has href it does not need a role - it is link by default
• if it does not have href then if does need role=button

If it renders as button:

• the type must be one of 'button', 'submit', 'reset'
• it does not need a role