Added validation of count argument for search/list.

[jedieaston]

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Resolves #1548, #1549.

This PR adds validation to the count argument for the search and list commands, throwing an exception if the value isn't between 1 and 1000 (or if it's out of bounds for an int, since that's what std::stoi converts to). I figured that if the user could handle >1000 results, they could most likely handle all of them, although I can fix this in two seconds if that's too low.

Please let me know if I put anything in the wrong place or if I did something wrong; this looked like an easy enough issue to tackle so I gave it a shot.

Tested manually (please let me know if I need to write unit tests).

Before:

PS C:\Users\easton> winget search 123 -n 853837271271781839344
An unexpected error occurred while executing the command:
stoi argument out of range
PS C:\Users\easton>

After:

PS C:\Users\easton> wingetdev search 123 -n 853837271271781839344
Windows Package Manager v1.0.2
Copyright (c) Microsoft Corporation. All rights reserved.

The requested number of results must be between 1 and 1000. <--- (In red, since it's a CommandException)

Searches for packages from configured sources.

usage: winget search [[-q] <query>] [<options>]

The following arguments are available:
  -q,--query                  The query used to search for a package

The following options are available:
  --id                        Filter results by id
  --name                      Filter results by name
  --moniker                   Filter results by moniker
  --tag                       Filter results by tag
  --command                   Filter results by command
  -s,--source                 Find package using the specified source
  -n,--count                  Show no more than specified number of results (between 1 and 1000).
  -e,--exact                  Find package using exact match
  --header                    Optional Windows-Package-Manager REST source HTTP header
  --accept-source-agreements  Accept all source agreements during source operations

More help can be found at: https://aka.ms/winget-command-search
PS C:\Users\easton>

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