Revert "Fix importing patch_decoder"

[w-e-w]

• reverts https://github.com/google-research/timesfm/pull/32

I'm pretty sure that "fix" actually broke this repo as a module

I belive the error ImportError: attempted relative import with no known parent package occurs if people try to run src/timesfm.py directly and they might have reason to do so because this reop did not work as a module on it's initial release

adding to this this repo is structured weirdly so people might be confused on how they should be using this repo and running the code

• shoud they be cloneing this in ther peoject as a module
• should they colne this project and add they own code into src/
• should they clone this as take parts of the code into the own project

---

timeline

• before fix code structure https://github.com/google-research/timesfm/commit/24bd19c74bd6b28eb576437f21b22b20f6536520 this repo only works under several conditions so people migh comewith diffrent creative ways ways of running the code
• after the commit fix code structure https://github.com/google-research/timesfm/commit/24bd19c74bd6b28eb576437f21b22b20f6536520 made this reop worked as a module but breaks running itdirectly
• then https://github.com/google-research/timesfm/pull/32 makes src/timesfm.py + src/patched_decoder.py as standload code but breaks this a module

---

• I sugest mergeing this PR reverting https://github.com/google-research/timesfm/pull/32 to make it function as a module for now
• and in the future restructure the project completely to a more typical structure like

├── README.md
├── timesfm/            <---- package name
│   ├── __init__.py
│   ├── module.py
│   └── module.py
└── other stuff/
    ├── generate_awesomeness.py
    └── decrease_world_suck.py

---

---

the reason I don't perform the restructure myself in this PR is because a the restructure of the project would cause existing users to have issues, my intention is to only get back to a code working state

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[w-e-w]

CLA... just treat this as an issue post