feat(contract): implement Filter's builder methods on Event #2936

Job	Run time
test ubuntu-latest stable --no-default-features	1m 31s
clippy	42s
test ubuntu-latest stable	1m 51s
doctest	1m 40s
test ubuntu-latest nightly --no-default-features	1m 3s
feature-checks	3m 23s
test ubuntu-latest nightly	1m 7s
no-std	14s
wasm-unknown	37s
test ubuntu-latest 1.76 --no-default-features	1m 12s
test ubuntu-latest 1.76	1m 0s
wasm-wasi	1m 5s
test windows-latest stable --no-default-features	5m 11s
cfg-check	30s
test windows-latest stable	4m 42s
test windows-latest nightly --no-default-features	3m 28s
docs	50s
fmt	14s
test windows-latest nightly	3m 31s
test windows-latest 1.76 --no-default-features	3m 17s
test windows-latest 1.76	3m 26s
	40m 34s

Provide feedback