Improve code snipper HTTP

Describe the bug

When the HTTP code snippet is generated, it is generated with the first letter in uppercase and the format should be the same as in the header. A difference if the type CURL is selected maintains the correct format.

To Reproduce
Execute a example of request.
Clic in code snipper {}.
In code select HTTP.

Expected behavior
The expected behavior is to keep the same format as the header, as is done in the CURL.

Platform:

OS: Windows 10
vscode version: 1.66.2
extension version: 1.18.7

Example:

Screenshot type http:
Screenshot type curl:

best regards

Start by reproducing the request-snippet steps in the issue and compare the generated HTTP and CURL outputs, focusing on capitalization and formatting. The work is done when the HTTP snippet preserves the same format as its header, matching the existing CURL behavior.

索引モデルが issue の本文から書いたものです。