Implement multiframe encryption correctly

[joeygrover]

Fixes #1642

This PR is ready for review.

Risk

This PR makes no API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).
• I have tested Android

Summary

The library is now setup to correctly encrypt multi frame packets by encrypting each frames payload rather than the entire payload first. The first frame will also no longer be marked as encrypted because it is not. Also fixed the logic for single frame messages when they were approaching the max size of a TLS record but still under the MTU. Receiving encrypted multiframe packets will no longer crash the library as the data size is reset to the decrypted data size before parsing further.

Changelog

Bug Fixes

• Fixed incorrect encryption flag being set for first frame
• Fixed encryption flow to match what is expected and frankly possible with TLS
• Fixed incoming encrypted multiframe packets from crashing the app

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #1644 (f12bffb) into release/5.1.0_RC (c480dd4) will decrease coverage by 0.02%.
The diff coverage is 5.40%.

❗ Current head f12bffb differs from pull request most recent head 385f314. Consider uploading reports for the commit 385f314 to get more accurate results

@@                  Coverage Diff                   @@
##             release/5.1.0_RC    #1644      +/-   ##
======================================================
- Coverage               54.06%   54.03%   -0.03%     
+ Complexity               5305     5304       -1     
======================================================
  Files                     555      555              
  Lines                   24504    24530      +26     
  Branches                 3088     3093       +5     
======================================================
+ Hits                    13248    13255       +7     
- Misses                  10107    10124      +17     
- Partials                 1149     1151       +2     

Impacted Files	Coverage Δ	Complexity Δ
...tdevicelink/managers/video/VideoStreamManager.java	22.33% <0.00%> (-0.42%)	21.00 <0.00> (ø)
.../com/smartdevicelink/protocol/SdlProtocolBase.java	15.79% <0.00%> (+0.20%)	22.00 <0.00> (ø)
...ain/java/com/smartdevicelink/transport/SdlPsm.java	20.65% <0.00%> (ø)	5.00 <0.00> (ø)
...tdevicelink/managers/screen/BaseScreenManager.java	68.78% <100.00%> (+0.33%)	56.00 <8.00> (ø)
...m/smartdevicelink/util/CorrelationIdGenerator.java	44.44% <0.00%> (-22.23%)	2.00% <0.00%> (-1.00%)
...nk/managers/audio/AudioDecoderCompatOperation.java	75.00% <0.00%> (-4.55%)	9.00% <0.00%> (-1.00%)
...rtdevicelink/streaming/video/SdlRemoteDisplay.java	51.85% <0.00%> (+1.23%)	5.00% <0.00%> (ø%)
.../main/java/com/smartdevicelink/util/DebugTool.java	17.20% <0.00%> (+2.15%)	12.00% <0.00%> (+1.00%)