Rename hedera to hiero in gradle files

[0xivanov]

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[0xivanov]

@jjohannes Would you be able to take a look at this? I've done the renaming for the .java files here. but I am not very familiar with the gradle structure in the sdk.

[jjohannes]

@0xivanov with the change of the Java packages and Module Name, we should also change the group the SDK is published under (IMO). This would be here: https://github.com/hashgraph/hedera-sdk-java/blob/main/gradle/plugins/src/main/kotlin/com.hedera.gradle.base.gradle.kts#L21
I suggest to change that in your PR as well.

The Gradle configuration files (convention plugins) also use the hedera in their IDs, but that is only internal to our build and has no influence on the published artifacts. I will change these to org.hiero.* as part of #2033.

[0xivanov]

Sounds good!