[#1769] Implement more Checkstyle checks (#2022)

Currently, RepoSense does not have Checkstyle for 
- JavadocTagContinuationIndentation
- DefaultComesLast
- NoWhitespaceBeforeCaseDefaultColon.

Adding these checks can make it easier for future contributors 
to adhere to Reposense's coding style.

Let's add more Checkstyle checks to ensure easier standardisation
of code style.

config/checkstyle/checkstyle.xml

@@ -218,6 +218,9 @@
  ORDER CHECKS
  -->
 
+ <!-- Checks that the default is after all the cases in a switch statement. -->
+ <module name="DefaultComesLast"/>
+
  <!-- Checks that the order of at-clauses follows the tagOrder default property value order.
  @author, @version, @param, @return, @throws, @exception, @see, @since, @serial, @serialField, @serialData, @deprecated
  -->
@@ -245,6 +248,9 @@
  WHITESPACE CHECKS
  -->
 
+ <!-- Checks that there is no whitespace before the colon in a switch block. -->
+ <module name="NoWhitespaceBeforeCaseDefaultColon"/>
+
  <!-- Checks that comments are indented relative to their position in the code -->
  <module name="CommentsIndentation"/>
 
@@ -358,6 +364,12 @@
  <!-- Checks that all Javadoc comments start from the second line. -->
  <module name="JavadocContentLocationCheck" />
 
+ <!-- Checks the indentation of the continuation lines in block tags. -->
+ <module name="JavadocTagContinuationIndentation">
+ <property name="offset" value="0"/>
+ <property name="violateExecutionOnNonTightHtml" value="true"/>
+ </module>
+
  <!-- Checks the Javadoc's format for every method (excluding getters, setters and constructors). -->
  <module name="JavadocMethod">
  <property name="allowMissingParamTags" value="true"/>