added more repr impls

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (925d604) 96.36% compared to head (cd0cd60) 96.38%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #55 +/- ## ========================================== + Coverage 96.36% 96.38% +0.02% ========================================== Files 84 84 Lines 6514 6525 +11 ========================================== + Hits 6277 6289 +12 + Misses 237 236 -1 ``` | [Flag](https://app.codecov.io/gh/us-irs/spacepackets-py/pull/55/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/us-irs/spacepackets-py/pull/55/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs) | `96.38% <100.00%> (+0.02%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/us-irs/spacepackets-py/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs) | Coverage Δ | | |---|---|---| | [spacepackets/cfdp/pdu/ack.py](https://app.codecov.io/gh/us-irs/spacepackets-py/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs#diff-c3BhY2VwYWNrZXRzL2NmZHAvcGR1L2Fjay5weQ==) | `100.00% <ø> (+1.47%)` | :arrow_up: | | [spacepackets/cfdp/pdu/keep\_alive.py](https://app.codecov.io/gh/us-irs/spacepackets-py/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs#diff-c3BhY2VwYWNrZXRzL2NmZHAvcGR1L2tlZXBfYWxpdmUucHk=) | `94.28% <ø> (ø)` | | | [spacepackets/cfdp/pdu/prompt.py](https://app.codecov.io/gh/us-irs/spacepackets-py/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs#diff-c3BhY2VwYWNrZXRzL2NmZHAvcGR1L3Byb21wdC5weQ==) | `96.15% <100.00%> (+0.15%)` | :arrow_up: | | [tests/cfdp/pdus/test\_ack\_pdu.py](https://app.codecov.io/gh/us-irs/spacepackets-py/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs#diff-dGVzdHMvY2ZkcC9wZHVzL3Rlc3RfYWNrX3BkdS5weQ==) | `98.00% <100.00%> (+0.17%)` | :arrow_up: | | [tests/cfdp/pdus/test\_keep\_alive\_pdu.py](https://app.codecov.io/gh/us-irs/spacepackets-py/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs#diff-dGVzdHMvY2ZkcC9wZHVzL3Rlc3Rfa2VlcF9hbGl2ZV9wZHUucHk=) | `100.00% <100.00%> (ø)` | | | [tests/cfdp/pdus/test\_prompt\_pdu.py](https://app.codecov.io/gh/us-irs/spacepackets-py/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=us-irs#diff-dGVzdHMvY2ZkcC9wZHVzL3Rlc3RfcHJvbXB0X3BkdS5weQ==) | `100.00% <100.00%> (ø)` | |

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