feat(gtest): introduce calculate_reply_for_handle in gtest

[techraed]

Resolves #4627 .

1. Adjust random generation logic (remove check_epoch, store random in global storage, update each epoch)
2. Move to global static almost every storage in gtest
3. Introduce overlay for each storage used in gtest (except for gas allowance)

[breathx]

imo gtest worth following refactoring:

1. move all thread-local storages into one file

struct Overlayable<T> {
    storage: RefCell<T>,
    overlay: Option<RefCell<T>>, // or just RefCell<T>
}

3. use p.2 for each storage in place without code copypasting. all of them should refer to one threadlocal OVERLAY_ENABLED: bool on each access

[techraed]

1. move all thread-local storages into one file

It would be nice moving everything to one place, but there are 2 considerations:

1. gear-common must have auxiliary gas tree, as it's used for property tesing
2. global storages in gtest are not related to gear-common. So moving everything from gear-common to gtest seems ok, but look at p.1

what do you think?

[techraed]

1. move all thread-local storages into one file

It would be nice moving everything to one place, but there are 2 considerations:

1. gear-common must have auxiliary gas tree, as it's used for property tesing
2. global storages in gtest are not related to gear-common. So moving everything from gear-common to gtest seems ok, but look at p.1

what do you think?

Discussed, continuing on this