Remove no-std and actual-serde features #2100

Job	Run time
Lint - nightly toolchain (recent)	28s
Test - 1.63.0 toolchain (minimal)	26m 22s
Test - nightly toolchain (minimal)	14m 19s
Test - 1.63.0 toolchain (recent)	26m 2s
Test - nightly toolchain (recent)	14m 57s
Docs - nightly toolchain (recent)	47s
Docs - stable toolchain (recent)	33s
Bench - nightly toolchain (recent)	59s
Embedded	1m 34s
Format - nightly toolchain	15s
Test - stable toolchain (minimal)	16m 2s
Integration tests - stable toolchain (26_0)	1m 12s
Test - stable toolchain (recent)	15m 37s
Integration tests - stable toolchain (25_2)	1m 5s
Integration tests - stable toolchain (25_1)	56s
Integration tests - stable toolchain (25_0)	49s
Integration tests - stable toolchain (24_2)	50s
Integration tests - stable toolchain (24_1)	58s
Integration tests - stable toolchain (24_0_1)	51s
Integration tests - stable toolchain (23_2)	50s
Integration tests - stable toolchain (23_1)	53s
Integration tests - stable toolchain (23_0)	49s
Integration tests - stable toolchain (22_1)	47s
Integration tests - stable toolchain (22_0)	48s
Integration tests - stable toolchain (0_21_2)	49s
Integration tests - stable toolchain (0_20_2)	47s
Integration tests - stable toolchain (0_19_1)	55s
Integration tests - stable toolchain (0_18_1)	46s
Integration tests - stable toolchain (0_17_1)	48s
	2h 12m 48s

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