Rename pipeline to sequence

[jrobinAV]

Rename pipeline to sequence in :

• module
• class attributes
• internal variables
• methods
• repository names,
• unit tests names
• taipy API (keeping deprecated the exposed API containing pipeline name)
• notifications
• docstrings for ref manual

To keep compatibility, do not rename (not yet?):

• Pipeline Object itself.
• Folder name in .data

[toan-quach]

@jrobinAV Some recommendations aside from sequence:

• Task groups
• Task subsets
• Task subgroups
• Task subdivisions
• Task fragments

[toan-quach]

• [x] Config
• [x] Core
• [x] Rest
• [x] Enterprise
• [ ] Integration