add more options for autoscaling collectors and endpoints

[boetro]

Couple other small change as well:

• added some additional tests for runtime server in our end to end tests
• allow serve host and port to be specified via the command line and default to 127.0.0.1 instead of 0.0.0.0
• include a version for buildflow
• include buildflow version in flowstate

[codecov[bot]]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (495d87d) 77.72% compared to head (5eaf670) 77.64%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #299 +/- ## ========================================== - Coverage 77.72% 77.64% -0.08% ========================================== Files 160 160 Lines 7047 7060 +13 ========================================== + Hits 5477 5482 +5 - Misses 1570 1578 +8 ``` | [Files](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow) | Coverage Δ | | |---|---|---| | [buildflow/\_\_init\_\_.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [buildflow/core/app/collector.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L2NvcmUvYXBwL2NvbGxlY3Rvci5weQ==) | `94.73% <ø> (ø)` | | | [buildflow/core/app/flow\_state.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L2NvcmUvYXBwL2Zsb3dfc3RhdGUucHk=) | `88.63% <100.00%> (+0.13%)` | :arrow_up: | | [buildflow/core/app/runtime/actors/runtime\_test.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L2NvcmUvYXBwL3J1bnRpbWUvYWN0b3JzL3J1bnRpbWVfdGVzdC5weQ==) | `94.96% <ø> (ø)` | | | [buildflow/core/app/service.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L2NvcmUvYXBwL3NlcnZpY2UucHk=) | `93.93% <100.00%> (+0.18%)` | :arrow_up: | | [buildflow/core/options/runtime\_options.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L2NvcmUvb3B0aW9ucy9ydW50aW1lX29wdGlvbnMucHk=) | `97.36% <100.00%> (+0.07%)` | :arrow_up: | | [buildflow/core/app/flow.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L2NvcmUvYXBwL2Zsb3cucHk=) | `76.79% <75.00%> (+0.04%)` | :arrow_up: | | [...runtime/actors/collector\_pattern/collector\_pool.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L2NvcmUvYXBwL3J1bnRpbWUvYWN0b3JzL2NvbGxlY3Rvcl9wYXR0ZXJuL2NvbGxlY3Rvcl9wb29sLnB5) | `50.94% <0.00%> (-2.00%)` | :arrow_down: | | [...tors/collector\_pattern/receive\_process\_push\_ack.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L2NvcmUvYXBwL3J1bnRpbWUvYWN0b3JzL2NvbGxlY3Rvcl9wYXR0ZXJuL3JlY2VpdmVfcHJvY2Vzc19wdXNoX2Fjay5weQ==) | `34.83% <0.00%> (-1.54%)` | :arrow_down: | | [...p/runtime/actors/endpoint\_pattern/endpoint\_pool.py](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow#diff-YnVpbGRmbG93L2NvcmUvYXBwL3J1bnRpbWUvYWN0b3JzL2VuZHBvaW50X3BhdHRlcm4vZW5kcG9pbnRfcG9vbC5weQ==) | `50.00% <0.00%> (-1.93%)` | :arrow_down: | | ... and [2 more](https://app.codecov.io/gh/launchflow/buildflow/pull/299?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=launchflow) | |

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