[BUG] Reading E4 should account to find directories inside each given directory, each representing a Segment

[jomy-kk]

Describe the bug
The way E4._read is implemented it expects csv files to be right on the given directory, but it should not.
Inside the given directory, it should expect subdirectories (probably named after the start timestamp), and each should be considered a Segment in time.

Example of tree:
--- given_path
    | ---- 1655923195_A0200B
        | ---- ACC.csv
        | ---- BVP.csv
    | ---- 1656324824_A0200B
        | ---- ACC.csv
        | ---- BVP.csv
    | ...

Modules
biosignals

To Reproduce
Instructions that reproduce the behavior:

E4._read(given_path, EDA)

Terminal/Console Error

Files were not found in path given_path

Expected behavior
To read files inside subdirectories, and consider each subdirectory as a Segment.

Python Version
3.10.4