1709 search download api

Description

ApplicationApiImpl will be divided into separate classes to avoid LongClass which is part of codesmell. In this MR, Search page and App download info related codes are separated. Some files are moved into new packages.

Screenshots

Technical details

An interface SearchApi and DownloadInfoApi are introduced. SearchApiImpl implements SearchApi interface and DownloadInfoApiImpl implements DownloadInfoApi.

The other changes are showing for moving some files into new packages.

Tests

Issues

backlog/-/issues/1709: Subtask: backlog/-/work_items/1745

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