feat(rust/cardano-chain-follower): add thread and mmap file stats

[bkioshn]

Description

Add thread and memory map file statistics

Related Issue(s)

Closes #145

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 266/266}$ | ${\color{red}Fail: 0/266}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 266/266}$ | ${\color{red}Fail: 0/266}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 266/266}$ | ${\color{red}Fail: 0/266}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 266/266}$ | ${\color{red}Fail: 0/266}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 266/266}$ | ${\color{red}Fail: 0/266}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 268/268}$ | ${\color{red}Fail: 0/268}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 268/268}$ | ${\color{red}Fail: 0/268}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 269/269}$ | ${\color{red}Fail: 0/269}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 269/269}$ | ${\color{red}Fail: 0/269}$ |

[stevenj]

Put the word async in tasks that are async and run with tokio::spawn

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 269/269}$ | ${\color{red}Fail: 0/269}$ |

[stevenj]

LGTM

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 271/271}$ | ${\color{red}Fail: 0/271}$ |