add context to Parse.Object.save

[mtrezza]

Exposes the context object in Parse.Object.save() so that parameters can be made accessible in Cloud Code triggers beforeSave, afterSave.

Example:

const obj = new TestObject();
await obj.save(null, {context: {a: "a"}});

Parse.Cloud.beforeSave("TestObject", req => {
    console.log(req.context.a);
});

Parse.Cloud.afterSave("TestObject", req => {
    console.log(req.context.a);
});

---

Don't merge until

• Concept agreed on in Make trigger context accessible in save #6459
• Merged add context to Parse.Object.save Parse-SDK-JS#1150 (this PR depends on it)

[acinader]

seems useful to me and looks good. curious any thoughts you might have @davimacedo and @dplewis

if we merge, i can add to the PHP sdk

[mtrezza]

@acinader There is an open question regarding security when exposing the context to the client.

I added this question to #6459.
Let me know what you think. Maybe let's discuss there since it's a more visible thread.

[dplewis]

@mtrezza The latest version of the SDK has been released and merged. You can update your branch and add the test cases.

[mtrezza]

@dplewis Great! Let's see if the tests pass 🤞

[codecov]

Codecov Report

Merging #6626 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #6626   +/-   ##
=======================================
  Coverage   93.88%   93.88%           
=======================================
  Files         169      169           
  Lines       11991    11994    +3     
=======================================
+ Hits        11258    11261    +3     
  Misses        733      733           

Impacted Files	Coverage Δ
src/RestWrite.js	93.67% <100.00%> (+0.03%)	⬆️

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[mtrezza]

@acinader ready for review

[uzaysan]

How can we use master key with context?

Is this correct:
await obj.save(null, {context: {a: "a"}, useMasterKey: true});

[davimacedo]

Yes. It should work.