Make it possible to insert several items at once

[augustebaum]

• Create put_several which is aliased to put
  • Only really put items once all have been converted to Items
• Make the one-item put a special case of put_several
• Make it a TypeError when Project.put receives a non-string key (closes Project keys must be strings #362)

[github-actions]

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Status	Category	Percentage	Covered / Total
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Generated in workflow #861

[thomass-dev]

Really happy to see singledispatchmethod in one of your PR <3.
Good idea !

[augustebaum]

Update to take into account design decisions in #173

[thomass-dev]

Nice work 👍🏻

[augustebaum]

In the end, we decided with @thomass-dev to simplify the behaviour:

• The user can set on_error, which by default is "warn", both in put for single key-value pairs and for a dict
• Whe the user sets on_error to "raise", we stop and raise upon the first exception found, rather than collecting all of them.

[thomass-dev]

A succession of put or one call to put_several have the same behaviour:

project.put("0", 0, on=error="warn")
project.put("1", 1, on=error="warn") 
project.put(2, 2, on=error="warn")  # bad
project.put("3", 3, on=error="warn")

# ==

project.put({"0": 0, "1": 1, 2: 2, "3": 3}, on=error="warn")

# OUTPUT
# ("0", 0), ("1", 1), ("3", 3) inserted
# warning on (2, 2)

project.put("0", 0, on=error="raise")
project.put("1", 1, on=error="raise") 
project.put(2, 2, on=error="raise")  # bad
project.put("3", 3, on=error="raise")

# ==

project.put({"0": 0, "1": 1, 2: 2, "3": 3}, on=error="raise")

# OUTPUT
# ("0", 0) and ("1", 1) inserted
# exception on (2, 2)