Refactor app fetching and caching logic

[thang14]

This pull request introduces significant changes to the core/apps package to improve the handling and caching of app data from GitHub and subnet sources. The most important changes include the addition of caching mechanisms, modifications to the app data structures, and enhancements to the app retrieval methods.

Caching Enhancements:

• core/apps/service.go: Added caching fields (gitHubAppCache and subnetAppCache) to the Service struct and initialized them in the New function. Implemented methods getGitHubApps, getGitHubAppByID, and getSubnetAppByID to fetch app data with caching. [1] [2] [3]

App Data Structure Modifications:

• core/apps/types/types.go: Updated the App struct to include new fields (Description, Logo, BannerUrls, DefaultBannerIndex, Website) and changed PeerId to PeerIds (a list of strings). Modified related functions to handle these changes. [1] [2] [3] [4]
• proto/subnet/app/app.pb.go: Updated the protobuf definition for the App struct to reflect the change from PeerId to PeerIds. [1] [2]

App Retrieval Enhancements:

• core/apps/app_details.go: Modified the GetApp method to fetch app data from GitHub and subnet sources, and merge them. Added logic to handle the new fields in the App struct.
• core/apps/app_list.go: Enhanced the GetApps method to fetch app data from GitHub and apply filtering criteria. Introduced a new GitHubApp struct and a helper function appMatchesFilter to support these changes.

API Adjustments:

• internal/api/apps.go: Updated the appResult struct and the convertToAppResult function to include the new fields from the App struct. [1] [2]

Miscellaneous:

• core/apps/app_report.go: Adjusted the reportAllRunningContainers method to handle the updated PeerIds field in the App struct.
• Added necessary imports in various files to support the new functionality.