Added validation for route name for http triggers

[gavin-aguiar]

Description

Added validation for route name for http triggers

Fixes #

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PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and CI is passing.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

Merging #1066 (880dc9b) into dev (00a907b) will increase coverage by 0.28%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #1066      +/-   ##
==========================================
+ Coverage   83.79%   84.08%   +0.28%     
==========================================
  Files          34       34              
  Lines        1858     1866       +8     
  Branches      299      300       +1     
==========================================
+ Hits         1557     1569      +12     
+ Misses        235      232       -3     
+ Partials       66       65       -1     

Flag	Coverage Δ
unittests	84.08% <100.00%> (+0.28%)	⬆️

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

Impacted Files	Coverage Δ
azure_functions_worker/functions.py	96.21% <100.00%> (+0.17%)	⬆️
azure_functions_worker/dispatcher.py	89.12% <0.00%> (+1.06%)	⬆️

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