fix(octet-stream): correct limits for integer serialization and add tests

[derwehr]

I noticed that the limits for integer serialization are wrong and corrected them. Additionally, I added test for these limits.

Changes in octetstream-codec.ts

• serializing 255 as unsigned integer with 8 bits failed, succeeds now;
• serializing 127 as signed integer with 8 bits failed, succeeds new;

Changes in ContentSerdesTest.ts

• added tests verifying that 255 as uint8, 127 and -128 as int8 succeed
• added tests verifying that 256 and -1 asunit8, 128 and -129 as int8 fail

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c130878) 77.75% compared to head (47e9408) 77.77%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1219      +/-   ##
==========================================
+ Coverage   77.75%   77.77%   +0.02%     
==========================================
  Files          84       84              
  Lines       17444    17452       +8     
  Branches     1765     1766       +1     
==========================================
+ Hits        13564    13574      +10     
+ Misses       3844     3842       -2     
  Partials       36       36              

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[danielpeintner]

I noticed that there is a style check issue. Can you run npm run format...

[danielpeintner]

@relu91, @JKRhb, others
any more comments before integrating the PR?