[wasi][icu] Add ICU sharding for wasi

[ilonatommy]

Now we are loading always full icu for wasi. Add sharding like in #80421.

Connected issues: #82895
In the sharding approach we cannot achieve automatic shard selection - we would need to bundle all icu to wasi first and then make the decision which shard to choose, that would in fact increases the upload size -> no point.
Instead, we could let the user choose the shard explicitly, e.g. using custom icu loading mechanism (it should bundle one, chosen icu file from runtime pack). For that we would use the same mechanism as for TZ/full icu - embedding into dotnet.wasm file.

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Issue Details

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Now we are loading always full icu for wasi. Add sharding like in #80421.

Author:	ilonatommy
Assignees:	ilonatommy, mkhamoyan
Labels:	arch-wasm, untriaged, os-wasi
Milestone:	-

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Issue Details

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Now we are loading always full icu for wasi. Add sharding like in #80421.

Author:	ilonatommy
Assignees:	ilonatommy, mkhamoyan
Labels:	arch-wasm, area-System.Globalization, os-wasi
Milestone:	8.0.0

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Issue Details

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Now we are loading always full icu for wasi. Add sharding like in #80421.

Author:	ilonatommy
Assignees:	ilonatommy, mkhamoyan
Labels:	arch-wasm, area-Infrastructure-mono, os-wasi
Milestone:	8.0.0

[pavelsavara]

For single file WASI:
after #82250 merge we could start thinking on how to bundle ICU shards during native relink.
The "InvariantGlobalization" is just a type of empty shard.
We could also disable loading of any shard, when env variable it set.

For default wasi - no relink + FS access
We could have all shards on the host file system and load it from disk based on env variable.

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