Introduce Examples class with comprehensive demos and enhance table/log functionalities

- Add `Examples` class showcasing extensive usage of terminal-ui components (e.g., tables, logs, heatmaps, charts, and trees).
- Extend `Table` API with `rows` and `fromRows` methods for batch row addition and simplified table creation.
- Enhance `Log` component with a `minLevel` filtering feature for selective log visibility.
- Update `build.gradle.kts` to set `Examples` class as the main application entry point.
- Expand `Examples.md` documentation with new examples, including table rows and filtered logs.

build.gradle.kts

@@ -5,6 +5,10 @@ plugins {
     id("maven-publish")
 }
 
+application {
+    mainClass.set("dev.jakub.terminal.example.Examples")
+}
+
 tasks.named<JavaExec>("run") {
     jvmArgs("-Ddev.jakub.terminal.ansi=true", "-Dfile.encoding=UTF-8")
 }