Allow setting of max retries

[Jawnnypoo]

Presently, the number of retries of a Parse command is always set to 5, and is not changeable. This allows you to set the number of max retries via the Parse.Configuration. Example:

 val config = Parse.Configuration.Builder(this)
                .applicationId("test")
                .clientKey("blah")
                .server("https://example.com/parse")
                .maxRetries(2)
                .build()

or even disable retries by setting maxRetries(0)

[natario1]

+10 for removing ParsePlugins.Android, such a headache. Looks good to me.

[codecov]

Codecov Report

Merging #782 into master will decrease coverage by 0.07%.
The diff coverage is 40.81%.

@@             Coverage Diff              @@
##             master     #782      +/-   ##
============================================
- Coverage     53.42%   53.34%   -0.08%     
- Complexity     1748     1749       +1     
============================================
  Files           132      132              
  Lines         10295    10267      -28     
  Branches       1428     1426       -2     
============================================
- Hits           5500     5477      -23     
+ Misses         4340     4337       -3     
+ Partials        455      453       -2

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/com/parse/NetworkObjectController.java	100% <ø> (ø)	10 <0> (ø)	⬇️
Parse/src/main/java/com/parse/ParseHttpClient.java	92.42% <ø> (+2.14%)	15 <0> (-2)	⬇️
...arse/src/main/java/com/parse/ParseRESTCommand.java	82.72% <ø> (-0.16%)	51 <0> (-1)
Parse/src/main/java/com/parse/ParseObject.java	50.95% <ø> (+0.06%)	205 <0> (ø)	⬇️
...e/src/main/java/com/parse/ParseFileController.java	80% <ø> (-0.42%)	14 <0> (ø)
...src/main/java/com/parse/ParseConfigController.java	100% <ø> (ø)	3 <0> (ø)	⬇️
...arse/src/main/java/com/parse/PushServiceApi26.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...rc/main/java/com/parse/NetworkQueryController.java	70% <0%> (+1.48%)	5 <0> (ø)	⬇️
.../src/main/java/com/parse/CacheQueryController.java	6.81% <0%> (ø)	1 <0> (ø)	⬇️
Parse/src/main/java/com/parse/PushService.java	64.1% <100%> (ø)	16 <0> (ø)	⬇️
... and 3 more

---

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[addisonElliott]

If I get time, I'll check this out.

@Jawnnypoo Wanted to let you know that this was on my (long) TODO list and I'm glad you submitted a PR for this! 👍

[rogerhu]

@addisonElliott if you can check it out that would be much appreciated =)

[addisonElliott]

Looks good to me. I pulled it locally and tested it out.

On a sidenote, what is the purpose of userAgent in the ParsePlugins class? It seems it is not used in Parse Android SDK and it is a private package, so it cannot be called. It may be worthwhile to create a function in Parse.java that calls this function. I can submit the PR if you would like.