[esp_linenoise] Fix small bugs and findings

[SoucheSouche]

Checklist

• CI passing

Change description

• Added getters for out_fd and in_fd config structure fields
• Removed self field in esp_linenoise_instance_t and related sanity check performed on it
• Added NULL pointer checks in public API
• Fixed typo in macro

[Copilot]

Pull Request Overview

This PR addresses minor bugs and code quality improvements in the esp_linenoise component, including fixing a macro naming typo, removing an unnecessary self-reference field, and adding getter functions for file descriptors.

• Fixed macro naming from esp_LINENOISE_CHECK_INSTANCE to ESP_LINENOISE_CHECK_INSTANCE
• Removed the self field from esp_linenoise_instance_t structure and its associated sanity check
• Added getter functions esp_linenoise_get_out_fd() and esp_linenoise_get_in_fd() with test coverage

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
esp_linenoise/src/esp_linenoise.c	Fixed macro naming, removed self-reference assignment, added inline getter functions for file descriptors
esp_linenoise/private_include/esp_linenoise_private.h	Removed self field from instance structure and its initialization
esp_linenoise/include/esp_linenoise.h	Added documentation for new getter functions
esp_linenoise/test_apps/main/test_esp_linenoise_get_set.c	Added test case for new file descriptor getter functions
esp_linenoise/idf_component.yml	Version bump from 1.0.0 to 1.0.1

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[SoucheSouche]

@suda-morris, feel free to merge if the CI is green.