Remove import of FieldEncoder from hologram #2765

Job	Run time
code-quality	1m 34s
build packages	22s
unit test / python 3.8	1m 28s
unit test / python 3.9	1m 25s
unit test / python 3.10	1m 2s
unit test / python 3.11	1m 9s
verify packages / python 3.8 / ubuntu-latest	45s
verify packages / python 3.9 / ubuntu-latest	48s
verify packages / python 3.10 / ubuntu-latest	1m 1s
verify packages / python 3.11 / ubuntu-latest	52s
verify packages / python 3.8 / macos-latest	5m 38s
verify packages / python 3.9 / macos-latest	1m 31s
verify packages / python 3.10 / macos-latest	1m 33s
verify packages / python 3.11 / macos-latest	1m 29s
verify packages / python 3.8 / windows-latest	4m 51s
verify packages / python 3.9 / windows-latest	2m 22s
verify packages / python 3.10 / windows-latest	1m 47s
verify packages / python 3.11 / windows-latest	4m 46s
	34m 23s

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