chore: add codeowners (DTCRCMERC-4949) (#1274)

Author: yeul

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @yeul @surekhaw @perco12 @jeremy-herman

.github/PULL_REQUEST_TEMPLATE.md

@@ -24,3 +24,26 @@
     Include any useful information that will help with testing this change specifically, if applicable
     General testing setup can be omitted - this should focus on setup unique to this PR
 -->
+
+## Review
+
+<!-- SLA: Please give us 3 days to engage with your PR. We will be notified when it is created. -->
+
+The expected SLA for reviews in this repo is days.
+
+All pull requests require an initial review from your team followed by code owner approval.
+
+While initial review is ongoing, please add the following label to your PR `Needs initial review`. This initial review process should ensure that:
+
+-   Code follows team standards and best practices
+-   Changes are thoroughly tested and verified
+-   The PR template is filled out
+-   Documentation is complete and accurate
+-   The PR is ready for official code owner review
+
+Once you have received initial approval, please do the following:
+
+-   Remove the label `Needs initial review`
+-   Add the label `Needs codeowner review`
+
+Code owners will then review the PR in accordance with our SLA. This process helps maintain code quality and reduces review cycles.