feat(bar): 新增 text 文字排版模块并将其集成到 bar 生命周期中

src/bar/text.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef struct text_context_t text_context_t;
+
+text_context_t *
+text_context_create(const char *family, uint32_t size, uint32_t dpi);
+void text_context_destory(text_context_t *context);