Add support for global_state in dryruns

[iglosiggio]

These changes add a global_state field to DryRunTransactionPrams.

Example code showing a possible usage:

from graviton.blackbox import DryRunExecutor, ExecutionMode, DryRunTransactionParams
from tests.clients import get_algod
teal = """
#pragma version 8
byte "value"
app_global_get
btoi
return
"""
algod = get_algod()
executor = DryRunExecutor(algod, ExecutionMode.Application, teal)
txn_params = DryRunTransactionParams.for_app(global_state={"value": b"\xff"})
run = executor.run_one((), txn_params=txn_params)
print(run.tabulate(500))
print("Cost:", run.cost())

Output:

   step |   PC# |   L# | Teal                              | Scratch   | Stack
--------+-------+------+-----------------------------------+-----------+----------------
      1 |     1 |    1 | #pragma version 8                 |           | []
      2 |     8 |    2 | pushbytes 0x76616c7565 // "value" |           | [0x76616c7565]
      3 |     9 |    3 | app_global_get                    |           | [0xff]
      4 |    10 |    4 | btoi                              |           | [255]
      5 |    11 |    5 | return                            |           | [255]
Cost: 4

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