Add `Node#type?` to reduce complexity of checking against multiple node types #1173

Job	Run time
Coding Style \| 3.0	34s
Prism	27s
Specs \| 2.7	40s
Main Gem Specs \| RuboCop: master \| 2.7	1m 52s
Specs \| 3.0	31s
Main Gem Specs \| RuboCop: master \| 3.0	1m 34s
Specs \| 3.1	35s
Main Gem Specs \| RuboCop: v1.61.0 \| 3.3	2m 10s
Specs \| 3.2	27s
Specs \| 3.3	25s
Specs \| head	23s
Coverage \| 2.7	40s
Specs "modern" \| 3.0	22s
Specs \| jruby	46s
Specs \| jruby-head	43s
Specs \| truffleruby	50s
Specs \| truffleruby-head	1m 4s
	14m 3s

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