Fix issue where copying bullets from the resulting pdf results in text with no whitespace and add cvsubitems

This solution is based on @chelseanbr's comment from July 28, 2023, https://github.com/posquit0/Awesome-CV/issues/71#issuecomment-1654964285.

Additionally this PR creates a new environment `cvsubitems`, that is functionally the same as `cvitems`, with the same workaround to allow reliable copypasting and parsing by ATS systems, but without some adjustments to vertical space that only make sense for `cvitems`

## Test Plan:

1. run `make`
2. Open all resulting PDFs and copy text from bullet points into a text editor, review that the copied text has spaces as expected.
3. Add a `cvsubitems` environment to the first `cventry` in experience to test that this also works as expected
4. Do the same copypaste test on `cv.pdf`, guaranteeing that we copy the subitems text.

awesome-cv.cls

@@ -740,15 +740,32 @@
 \newenvironment{cvitems}{%
   \vspace{-4.0mm}
   \begin{justify}
-  \begin{itemize}[leftmargin=2ex, nosep, noitemsep]
-    \setlength{\parskip}{0pt}
-    \renewcommand{\labelitemi}{\bullet}
-}{%
+    \begin{itemize}[leftmargin=2ex, nosep, noitemsep, label=]
+      \setlength\itemsep{0pt}
+      \setlength\parskip{0pt}
+      \setlength\parsep{0pt}
+      \renewcommand\labelitemi{\hspace{0.2em}\textbullet\hspace{0.2em}}
+     }{%
     \end{itemize}
   \end{justify}
   \vspace{-4.0mm}
 }
 
+% Define an environment for cvsubitems (Same as the above but without retaking vertical space)
+\newenvironment{cvsubitems}{%
+  \begin{justify}
+    \begin{itemize}[leftmargin=2ex, nosep, noitemsep, label=]
+      \setlength\itemsep{0pt}
+      \setlength\parskip{0pt}
+      \setlength\parsep{0pt}
+      \renewcommand\labelitemi{\hspace{0.2em}\textbullet\hspace{0.2em}}
+      \renewcommand\labelitemii{\hspace{0.2em}\textopenbullet\hspace{0.2em}}
+      \renewcommand\labelitemiii{\hspace{0.2em}\textasteriskcentered\hspace{0.2em}}
+      }{%
+    \end{itemize}
+  \end{justify}
+}
+
 
 %-------------------------------------------------------------------------------
 %                Commands for elements of Cover Letter

examples/cv/experience.tex

@@ -18,6 +18,9 @@
     {
       \begin{cvitems} % Description(s) of tasks/responsibilities
         \item {Everything that matters.}
+        \begin{cvsubitems}
+          \item Here is some more details on everything
+        \end{cvsubitems}
         \item {Designed and provisioned the entire infrastructure on the AWS cloud to meet security compliance and acquire a business license for financial services in Korea.}
         \item {Continuously improved the infrastructure architecture since launching the service. (currently 3.6 million users)}
         \item {Established a standardized base for declarative management of infrastructures and service deployments, enabling operational efficiency and consistency. Over 90\% of AWS resources were all managed through standardized terraform modules. All add-ons and service workloads on the Kubernetes cluster were managed on a GitOps basis with Kustomize and ArgoCD.}