Add URI action support to quick reply

[clsung]

• with example
• with test
  Ref: https://developers.line.biz/en/news/2021/03/10/messaging-api-update-march-2021/#202103-01

[codecov-io]

Codecov Report

Merging #267 (2d67505) into master (b63a33f) will increase coverage by 0.37%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #267      +/-   ##
==========================================
+ Coverage   77.51%   77.88%   +0.37%     
==========================================
  Files          34       34              
  Lines        2206     2207       +1     
==========================================
+ Hits         1710     1719       +9     
+ Misses        385      377       -8     
  Partials      111      111              

Impacted Files	Coverage Δ
linebot/actions.go	81.13% <0.00%> (+7.79%)	⬆️

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[kkdai]

LGTM