gui: enhance search page

[cosven]

1. remember search settings (search from which providers)
2. show search performance

[coveralls]

Pull Request Test Coverage Report for Build 9334595997

Details

• 24 of 82 (29.27%) changed or added relevant lines in 5 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.005%) to 55.24%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
feeluown/app/gui_app.py	0	3	0.0%
feeluown/gui/widgets/labels.py	13	18	72.22%
feeluown/gui/pages/search.py	7	57	12.28%
<!--	Total:	24	82	29.27%	-->

Files with Coverage Reduction	New Missed Lines	%
feeluown/gui/pages/search.py	2	24.35%
feeluown/app/gui_app.py	2	68.32%
<!--	Total:	4		-->

Totals
Change from base Build 9244211226:	-0.005%
Covered Lines:	9814
Relevant Lines:	17766

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💛 - Coveralls