fix: Add fallback to setObject(int, Object) for Number

[RobertZenz]

This pull request adds the fallback in question in #810.

It adds the following changes:

• There is a new (private) setNumber(int, Number) method in PgPreparedStatement with the same functionality as setBigDecimal(int, BigDecimal).
• setBigDecimal(int, BigDecimal) does invoke setNumber(int, Number).
• A case has been added in setObject(int, Object) for when a Number of an unknown/unhandled type is given.
• Unittests for this.

I've opted for the least intrusive way of adding this by simply adding another check "at the end" to see if the given Object is of the type Number. If yes, it is forwarded to setNumber(int, Number).

[vlsi]

Why did you implement autoboxing-related changes?
Can you elaborate?

[RobertZenz]

@vlsi Should I purge that commit?

[codecov-io]

Codecov Report

Merging #812 into master will increase coverage by 0.02%.
The diff coverage is 75%.

@@             Coverage Diff             @@
##             master    #812      +/-   ##
===========================================
+ Coverage     65.27%   65.3%   +0.02%     
- Complexity     3520    3524       +4     
===========================================
  Files           166     166              
  Lines         15228   15232       +4     
  Branches       2466    2467       +1     
===========================================
+ Hits           9940    9947       +7     
+ Misses         4099    4098       -1     
+ Partials       1189    1187       -2

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[vlsi]

Should I purge that commit?

I would love to see just those changes that are required, tested, etc.
Please remove boxing-related changes and/or split them to a separate PR along with tests proving the need.

[RobertZenz]

@vlsi I've purged said commit.

[vlsi]

Can you please split the test method to several ones and use relevant assert message? (see https://github.com/pgjdbc/pgjdbc/blob/master/CONTRIBUTING.md#test )

[RobertZenz]

I've split it into three methods, though I'm not sure if the two fallback tests shouldn't be one.

[RobertZenz]

Is there something missing in the request or can this be pulled as is?

[RobertZenz]

Ping

[davecramer]

LGTM, barring any objections I'll merge this tomorrow