XWIKI-10405: Implement a new Platform Mail Sender API

.gitignore

README.md

src/main/java/org/xwiki/mailSender/MailSender.java

src/main/java/org/xwiki/mailSender/MailSenderUtils.java

...java/org/xwiki/mailSender/internal/DefaultMailSender.java

...org/xwiki/mailSender/internal/DefaultMailSenderUtils.java

src/main/java/org/xwiki/mailSender/internal/Mail.java

...java/org/xwiki/mailSender/internal/MailConfiguration.java

...rg/xwiki/mailSender/internal/MailSenderScriptService.java

...iki/mailSender/internal/MailSenderUtilsScriptService.java

...n/java/org/xwiki/mailSender/internal/MimePartCreator.java

src/main/java/org/xwiki/mailSender/internal/VCalendar.java

src/main/resources/META-INF/components.txt

src/test/java/org/xwiki/mailSender/MailSenderTest.java

src/test/java/org/xwiki/mailSender/MailSenderUtilsTest.java