bugfix: fix parsing/serialization bug when map values are uint64 or int64

[joshmossas]

• fix bug where ts client doesn't parse map entries correctly if the values
• fix bug where kotlin client doesn't serialize uint64 and int64 correctly when it is a map value
• update integration tests to check for this bug to prevent regressions

[nx-cloud]

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✅ Successfully ran 8 targets

• nx affected -t integration-test --parallel=false
• nx affected -t test
• nx build-server test-server
• nx affected -t typecheck
• nx run-many -t build --exclude=playground
• nx affected -t lint
• nx run-many -t pub -- get
• nx affected -t pub -- get

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