Add OffsetPagination::addLinkAttributes() and GridView::filterFormAttributes(). Fix sortableLinkAttributes usage.

[vjik]

Q	A
Is bugfix?	✔️
New feature?	✔️
Breaks BC?	❌

[codecov]

Codecov Report

Attention: Patch coverage is 38.46154% with 8 lines in your changes missing coverage. Please review.

Project coverage is 86.19%. Comparing base (d2e479b) to head (63f8724).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/GridView.php	50.00%	4 Missing ⚠️
src/Pagination/OffsetPagination.php	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #276      +/-   ##
============================================
- Coverage     86.50%   86.19%   -0.32%     
- Complexity      636      638       +2     
============================================
  Files            50       50              
  Lines          2164     2173       +9     
============================================
+ Hits           1872     1873       +1     
- Misses          292      300       +8     

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