Add Vector.removeElement and trimToSize methods with tests #657

Job	Run time
rust_ci (ubuntu-latest, stable)	52s
rust_ci (macos-latest, beta)	53s
rust_ci (macos-latest, stable)	53s
rust_ci (windows-latest, beta)	50s
rust_ci (windows-latest, stable)	42s
rust_ci (ubuntu-latest, beta)	38s
	4m 48s

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