Fix enable virtual operations

[sbiscigl]

Issue #, if available:

#3715

Description of changes:

• creates a easier interface to disable methods on clients via the python code gen for users that want to link statically and use link optimizations to lower the binary size

python3.9 tools/scripts/run_code_generation.py --client_list s3 --disable-virtual-operations --debug

• adds virtual correctly to all functions in a service client, and the "vitrualness" of these functions will adhere to the enable-virutal-functions codegen parameter.

Check all that applies:

• Did a review by yourself.
• Added proper tests to cover this PR. (If tests are not applicable, explain.)
• Checked if this PR is a breaking (APIs have been changed) change.
• Checked if this PR will not introduce cross-platform inconsistent behavior.
• Checked if this PR would require a ReadMe/Wiki update.

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