(rpc_server): allow to fetch state key by prefix without state_size_limit

[kobayurii]

In this pull request, we have added the ability to always request a state key by prefix without state_size_limit.

[kobayurii]

@race-of-sloths please, include my PR in the Race

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Current status: executed

Reviewer	Score
@khorolets	2

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[khorolets]

@race-of-sloths score 2