fix: support linebreaks in Raw element

[timofei-iatsenko]

Component / Package Name: <Raw />

Support linebreaks in the <Raw> element. I came across this issue trying to implement some more complicated logic for keycloack email templates:

        <Raw
          content={`
    <#assign requiredActionsText>
        <#if requiredActions??>
           <#list requiredActions>
              <#items as reqActionItem>
                 \${msg("requiredAction.\${reqActionItem}")} <#sep>,</#sep>
              </#items>
           </#list>
        </#if>
    </#assign>
    `}
        />

And that was rendered with underlying <jsx-email-raw><!-- ... --></jsx-email-raw>:

<jsx-email-raw><!--
    <#assign requiredActionsText>
        <#if requiredActions??>
           <#list requiredActions>
              <#items as reqActionItem>
                 ${msg("requiredAction.${reqActionItem}")} <#sep>,</#sep>
              </#items>
           </#list>
        </#if>
    </#assign>
    --></jsx-email-raw>

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

If yes, please include "BREAKING CHANGES:" in the first commit message body, followed by a description of what is breaking.

List any relevant issue numbers:

Description

[shellscape]

Thanks a lot for the PR!