#118 - Add support for `yield` statement

[Jeckerson]

Hello!

• Type: new feature
• Link to issue: #118

In raising this pull request, I confirm the following:

• [x] I have read and understood the Contributing Guidelines
• [x] I have checked that another pull request for this purpose does not exist.
• [x] I wrote some tests for this PR.

Thanks

[codecov[bot]]

Codecov Report

Merging #122 (1dc8955) into development (5605563) will increase coverage by 0.47%. The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #122      +/-   ##
===============================================
+ Coverage        75.32%   75.79%   +0.47%     
===============================================
  Files                5        5              
  Lines             2926     2954      +28     
===============================================
+ Hits              2204     2239      +35     
+ Misses             722      715       -7     

Flag	Coverage Δ
unittests	75.79% <100.00%> (+0.47%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
parser/base.c	93.86% <100.00%> (+0.03%)	:arrow_up:
parser/parser.h	89.52% <100.00%> (+0.45%)	:arrow_up:
parser/scanner.re	98.28% <100.00%> (+<0.01%)	:arrow_up:
parser/zephir.lemon	48.44% <100.00%> (+0.88%)	:arrow_up:

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[AlexNDRmac]

@Jeckerson can you add a test with lambda func, please.