Add tr() and td() functions

[roxblnfk]

What was changed

Added tr() and td() shortcuts.

• tr(...) equals to trap(...)->return().
• td(...) equals to trap(...); die;
• The both functions will send short stack trace with memory usage and delta time between calls if no arguments are passed

Why?

Checklist

• Tested
  • Tested manually
  • Unit tests added
• Documentation

[codecov]

Codecov Report

Attention: Patch coverage is 56.06061% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 24.77%. Comparing base (78873fb) to head (5c6e473).
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/Client/Caster/TraceCaster.php	0.00%	20 Missing ⚠️
src/functions.php	61.53%	5 Missing ⚠️
src/Client/TrapHandle.php	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #102      +/-   ##
============================================
+ Coverage     24.21%   24.77%   +0.56%     
- Complexity     1122     1135      +13     
============================================
  Files           129      132       +3     
  Lines          3403     3467      +64     
============================================
+ Hits            824      859      +35     
- Misses         2579     2608      +29     

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