[filter/ext] Replace asserts with error handling

[filter/ext] Replace asserts with error handling

Replace asserts with appropriate error handling in tensor filter extensions
This will allows test cases for failure scenarios and handle erronous inputs
via single-shot API gracefully with error return than shutting down with assert failure

V2:
Applied for custom filters as well

Signed-off-by: Parichay Kapoor <pk.kapoor@samsung.com>