Bill CPU for WASM instantiation

[heifner]

Currently we pause the CPU billing timer for WASM instantiation.

spring/libraries/chain/include/eosio/chain/wasm_interface_private.hpp

Line 301 in 84d6beb

trx_context.pause_billing_timer();

No reason to do this anymore. Should just remove this pause of the timer and bill for the WASM instantiation time.

[spoonincode]

Pausing it makes billing more 'fair', since otherwise if you bill for it, it means the account who is unlucky and causes an instantiation after a BP restarts their node gets billed for this 'unfairly'.