Release v2.4

What's Changed

• Update build.gradle by @rlreamy in #134
• Create changelog.md by @rlreamy in #135
• KPMP-5138: add ALL count to summaries by @HaneenT in #136
• KPMP-5138: update dataSummary function with correct query by @HaneenT in #137
• Update changelog.md by @rlreamy in #139
• Release v2.4 by @rlreamy in #138
• Update DataSummaryRepository.java by @rlreamy in #140
• Fix for incorrect numbers on atlas home page by @rlreamy in #141

Full Changelog: v2.3.1...v2.4