Remove import of FieldEncoder from hologram #2766

Job	Run time
build packages	23s
code-quality	1m 46s
unit test / python 3.8	1m 19s
unit test / python 3.9	1m 8s
unit test / python 3.10	1m 5s
unit test / python 3.11	1m 15s
verify packages / python 3.8 / ubuntu-latest	46s
verify packages / python 3.9 / ubuntu-latest	1m 10s
verify packages / python 3.10 / ubuntu-latest	51s
verify packages / python 3.11 / ubuntu-latest	46s
verify packages / python 3.8 / macos-latest	3m 9s
verify packages / python 3.9 / macos-latest	3m 52s
verify packages / python 3.10 / macos-latest	1m 46s
verify packages / python 3.11 / macos-latest	1m 23s
verify packages / python 3.8 / windows-latest	2m 5s
verify packages / python 3.9 / windows-latest	2m 58s
verify packages / python 3.10 / windows-latest	2m 3s
verify packages / python 3.11 / windows-latest	2m 56s
	30m 41s

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