Address rustfmt differences for re-enabled rustfmt CI/CD check

[nirosys]

Issue #, if available: n/a

Description of changes:
This PR is just the result of running rustfmt. With the changes made in #1006, the rustfmt check was re-enabled after some period of not being run in the workflow resulting in failures due to rustfmt diffs being detected.

In a few cases I added in #[rustfmt::skip] in order to maintain spacing in comments for multi-line byte slices that contained ion text equivalent comments. Otherwise, the changes are all rustfmt provided.

Before PR

% cargo fmt --check --message-format 'short'
/Users/glitch/Code/sandbox/ion-rust/benches/byod.rs
/Users/glitch/Code/sandbox/ion-rust/benches/encoding_primitives.rs
/Users/glitch/Code/sandbox/ion-rust/benches/write_many_structs.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/binary/raw/v1_1/binary_buffer.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/binary/raw/v1_1/e_expression.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/binary/raw/value.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/encoder/binary/v1_1/container_writers.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/encoder/binary/v1_1/fixed_uint.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/encoder/binary/v1_1/value_writer.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/encoder/writer.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/expanded/e_expression.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/expanded/macro_evaluator.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/expanded/template.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/reader.rs
/Users/glitch/Code/sandbox/ion-rust/src/lazy/struct.rs
/Users/glitch/Code/sandbox/ion-rust/src/serde/de.rs
/Users/glitch/Code/sandbox/ion-rust/src/serde/mod.rs
/Users/glitch/Code/sandbox/ion-rust/src/serde/ser.rs
/Users/glitch/Code/sandbox/ion-rust/src/types/decimal/mod.rs
/Users/glitch/Code/sandbox/ion-rust/src/types/mod.rs
/Users/glitch/Code/sandbox/ion-rust/tests/conformance_dsl/model.rs
/Users/glitch/Code/sandbox/ion-rust/tests/conformance_dsl/model.rs
/Users/glitch/Code/sandbox/ion-rust/tests/conformance_tests.rs
/Users/glitch/Code/sandbox/ion-rust/tests/ion_hash_tests.rs
% cargo fmt --check --message-format 'short' | wc -l
      24

After PR

% cargo fmt --check --message-format 'short'
%

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.