Added --connect-timeout

[ameshkov]

Closes #43

[Copilot]

Pull Request Overview

This PR adds support for the --connect-timeout command-line argument to gocurl, addressing issue #43. The feature allows users to specify a maximum time in seconds for the connection phase, which applies to both direct connections and proxy connections (including SOCKS5).

• Added ConnectTimeout field to configuration structures and command-line options
• Implemented timeout support across all connection types (direct, HTTP/HTTPS proxy, SOCKS5 proxy)
• Updated test suite to verify timeout functionality and refactored for better testability

Reviewed Changes

Copilot reviewed 18 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/config/options.go	Added ConnectTimeout field and updated parseOptions to accept args parameter
internal/config/config.go	Added ConnectTimeout field to Config struct and updated ParseConfig signature
internal/cmd/cmd.go	Refactored Main function to extract testable Run function with proper error handling
internal/output/output.go	Enhanced Output struct with Writer interface, added Error method and JSON output support
internal/client/clientdialer.go	Added timeout conversion and propagation to dialers
internal/client/dialer/direct.go	Implemented connection timeout for direct connections
internal/client/proxy/*.go	Added timeout support for SOCKS5 and HTTP proxy connections
internal/cmd/cmd_test.go	Added comprehensive test suite for command functionality
Multiple test files	Updated NewOutput calls to include new jsonOutput parameter
go.mod	Updated Go version and dependencies
README.md	Added documentation for --connect-timeout flag

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