优化stream，不额外添加停顿时间，另外，就是在verbose时显示FCFR的时间

Fixes #269

Author: chenxizhang

code365scripts.openai/Public/New-ChatGPTConversation.ps1

@@ -534,13 +534,21 @@ function New-ChatGPTConversation {
 
                 if ($stream) {
                     Write-Verbose ($resources.verbose_chat_stream_mode)
+
+                    # new stopwatch
+                    $stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
                     $callapi = Invoke-StreamWebRequest -uri $params.Uri -body $params.Body -header $header
                     # if the status of callapi is not ok, then write the error message to host and continue
                     if ($callapi.status -ne "ok") {
                         Write-Host "`r[$current] $($callapi.message)" -NoNewline -ForegroundColor Red
                         Write-Host ""
                         continue
                     }
+
+                    # print the verbose message include the stopwatch time
+                    Write-Verbose ("FCFR - {0} ms " -f ($stopwatch.ElapsedMilliseconds))
+                    $stopwatch.Stop()
+                    
 
                     # otherwise, get the read of the result
                     $reader = $callapi.reader
@@ -633,7 +641,6 @@ function New-ChatGPTConversation {
                         $chunk = ($line -replace "data: ", "" | ConvertFrom-Json).choices.delta.content
                         Write-Host $chunk -NoNewline -ForegroundColor Green
                         $result += $chunk
-                        Start-Sleep -Milliseconds 5
                     }
 
                     Write-Host ""    
@@ -642,6 +649,8 @@ function New-ChatGPTConversation {
                         content = $result
                     }
 
+
+
                     Write-Verbose ($resources.verbose_chat_message_combined -f ($messages | ConvertTo-Json -Depth 10))
 
                 }