feat: add send mail command

gradle/libs.versions.toml

@@ -7,6 +7,7 @@ exposedVersion = "0.53.0"
 sqliteJDBCVersion = "3.46.1.0"
 motdPingerVersion = "1.0.1"
 animatedGifLibVersion = "1.4"
+simpleJavaMailVersion = "8.11.3"
 
 [libraries]
 rOneBot = { group = "cn.rtast", name = "ROneBot", version.ref = "ronebotVersion" }
@@ -16,6 +17,7 @@ exposedCore = { group = "org.jetbrains.exposed", name = "exposed-core", version.
 exposedJDBC = { group = "org.jetbrains.exposed", name = "exposed-jdbc", version.ref = "exposedVersion" }
 sqliteJDBC = { group = "org.xerial", name = "sqlite-jdbc", version.ref = "sqliteJDBCVersion" }
 animated-gif-lib = { group = "com.madgag", name = "animated-gif-lib", version.ref = "animatedGifLibVersion" }
+simple-java-mail = {group="org.simplejavamail", name="simple-java-mail",version.ref="simpleJavaMailVersion"}
 
 [bundles]