Add options for AnonymousUtils

[dplewis]

This PR also addresses an issue.

const user1 = await Parse.User.signUp('anon-not', '1234'); // is current user
const user2 = await Parse.AnonymousUtils.logIn(); // request are made with user1 sessionToken
user2.set('foo', 'bar');
// user2 doesn't have a sessionToken because of https://github.com/parse-community/parse-server/pull/5801
// LinkWith sessionToken won't generate new session token
user2.save();

[codecov]

Codecov Report

Merging #860 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #860      +/-   ##
==========================================
+ Coverage   92.09%   92.12%   +0.02%     
==========================================
  Files          54       54              
  Lines        4987     4988       +1     
  Branches     1112     1114       +2     
==========================================
+ Hits         4593     4595       +2     
+ Misses        394      393       -1

Impacted Files	Coverage Δ
src/AnonymousUtils.js	100% <100%> (ø)	⬆️
src/ParseUser.js	83.18% <100%> (+0.03%)	⬆️
src/ParseObject.js	90.21% <0%> (+0.11%)	⬆️

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[acinader]

lgtm

[dplewis]

I’m going to write a few test them draft a release

[acinader]

lgtm.