Added Delete specific search feature(#2241)

[cypherop]

Fixes #2241 Delete specific search

What changes did you make and why?
Used OnItemLongClickListener to delete specific search .On long click a dialog box appears asking the user if he wants to delete this search

Tested on Motorola Moto G5 plus with API level 24.

[codecov-io]

Codecov Report

Merging #2275 into master will decrease coverage by 3.58%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #2275      +/-   ##
=========================================
- Coverage    6.28%   2.69%   -3.59%     
=========================================
  Files         233     258      +25     
  Lines       11600   12312     +712     
  Branches     1069    1114      +45     
=========================================
- Hits          729     332     -397     
- Misses      10810   11954    +1144     
+ Partials       61      26      -35

Impacted Files	Coverage Δ
...mons/explore/recentsearches/RecentSearchesDao.java	0% <0%> (ø)	⬆️
...explore/recentsearches/RecentSearchesFragment.java	0% <0%> (ø)	⬆️
...r/free/nrw/commons/utils/model/ConnectionType.java	0% <0%> (-100%)	⬇️
.../fr/free/nrw/commons/logging/CommonsLogSender.java	0% <0%> (-93.11%)	⬇️
.../java/fr/free/nrw/commons/di/NetworkingModule.java	0% <0%> (-90%)	⬇️
...e/nrw/commons/di/CommonsDaggerContentProvider.java	0% <0%> (-80%)	⬇️
...java/fr/free/nrw/commons/utils/DeviceInfoUtil.java	0% <0%> (-75%)	⬇️
.../free/nrw/commons/di/ApplicationlessInjection.java	0% <0%> (-73.69%)	⬇️
...nrw/commons/di/CommonsDaggerAppCompatActivity.java	0% <0%> (-72.73%)	⬇️
...n/java/fr/free/nrw/commons/theme/BaseActivity.java	0% <0%> (-66.67%)	⬇️
... and 147 more

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[domdomegg]

Tested 2.9.0-debug-fix#2241~2d8999bca

[domdomegg]

Sorry about the long wait for a review. Looks great to me, will merge once Travis build is finished.