Add WMT24Esa unsup metrics

metrics/wmt24esa/wmt24esa_unsupervised_metrics_cs-uk.json

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+size 182279237

metrics/wmt24esa/wmt24esa_unsupervised_metrics_en-cs.json

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 version https://git-lfs.github.com/spec/v1
-oid sha256:fccf68bd5a82bcaa63cd8c740720406de9e320877cd1479440563d960803cc25
-size 204270606
+oid sha256:bbafae083ce0db248590eb4c18044853623cbce6b17a765987a961ecb44f42af
+size 204345831

metrics/wmt24esa/wmt24esa_unsupervised_metrics_en-hi.json

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+oid sha256:a1e323f868fd01fe5298e2d3d986c76fad3a863343d91ea851e854af2e09f726
+size 462468371

metrics/wmt24esa/wmt24esa_unsupervised_metrics_en-ja.json

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 version https://git-lfs.github.com/spec/v1
-oid sha256:fe8a58f9509eb66ec1b24bf7713cfd9d854f7d7b5ddeb703d2e77524243a26da
-size 258331826
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+size 258694121

metrics/wmt24esa/wmt24esa_unsupervised_metrics_en-ru.json

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+oid sha256:96928da6d98b59b116e71df7539b652e317fe8bc701779c4e8178fee10345158
+size 133375829

metrics/wmt24esa/wmt24esa_unsupervised_metrics_en-zh.json

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 version https://git-lfs.github.com/spec/v1
-oid sha256:d816744a08df0ebbaf0993aad03f171291ac59063538a8409245fbd932f1f332
-size 215628076
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+size 215878003