Make the test timeout a configurable value

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👾 Description of the issue

Currently, tests are hardcoded to timeout after 30 seconds. This should be made a configurable value.

Proposed Solution

Add a TEST_TIMEOUT configuration value to the .env.custom_node and .env.testnet files that allows a user to control how quickly a test should timeout.
Make necessary code changes to pull in this value and set it for all test suites. This includes all *.js files under the test/ directory. A describe block is used to demarcate the tests for a specific request type and within the describe block, there should be a this.timeout(30000); line or something to that effect. This is what specifies the timeout for tests. If no value is provided, a default value (30) should be used.
Verify the timeout. Follow the directions in the README to start an SDK server and configure the TCK to run with the hedera-local-node and run it. Change the NODE_IP value in your .env file to use a different port and set TEST_TIMEOUT to 2000. Run the TCK using npm test run and observe the tests failing after 2 seconds. You should be able to then change the value to 3000 to see the tests failing after 3 seconds.

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hashgraph / hedera-sdk-tck