notify developers of new cli version and enable update via kl update command

Reviewer's Guide by Sourcery

This pull request implements a version check and update mechanism for the Kloudlite CLI tool. It adds functionality to notify developers of new CLI versions and enables updates via the 'kl update' command.

Sequence diagram for CLI version check and update

sequenceDiagram
    participant User
    participant CLI as Kloudlite CLI
    participant Updater
    participant FileClient

    User->>CLI: Start CLI
    CLI->>FileClient: GetExtraData()
    alt Last update check > 12 hours
        CLI->>Updater: NewUpdater()
        CLI->>Updater: CheckForUpdates()
        alt Update available
            Updater->>CLI: GetUpdateMessage()
            CLI->>User: Notify new version available
            CLI->>FileClient: SaveExtraData()
        end
    end

Updated class diagram for Updater

classDiagram
    class Updater {
        +CheckForUpdates() bool
        +GetUpdateMessage() *string
        +Update() error
        +GetUpdateUrl() *string
    }
    class updater {
        -releaseInfo map[string]string
        +fetchReleaseInfo() map[string]string
    }
    Updater <|.. updater
    updater --> Updater: implements
    class FileClient {
        +GetExtraData() ExtraData
        +SaveExtraData(data ExtraData)
    }
    class ExtraData {
        +string BaseUrl
        +string SelectedTeam
        +string DnsHostSuffix
        +map SelectedEnvs
        +time.Time LastUpdateCheck
    }

File-Level Changes

Change	Details	Files
Implemented version checking mechanism	Added a versionCheck function to periodically check for updates Created a new updater package with functions to check for updates and retrieve update messages Modified the root command to include version checking logic	`clis/kl/root.go` `pkg/updater/main.go`
Enhanced the update command functionality	Modified the update command to use the new updater package Removed the hidden flag from the update command Updated the command to accept version as an argument instead of a flag	`clis/kl/update.go`
Updated data structures and constants	Added LastUpdateCheck field to ExtraData struct Updated the UpdateURL constant	`domain/fileclient/context.go` `constants/main.go`

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kloudlite / kl