Update nuspec to place library under nano TFM

[Copilot]

The nuspec was placing library files directly under lib\ and declaring dependencies without a target framework group, neither of which aligns with the .NETnanoFramework1.0 TFM convention used across nanoFramework packages.

Changes

• Dependency group: Wrapped nanoFramework.CoreLibrary dependency in <group targetFramework=".NETnanoFramework1.0">
• File target: Replaced five individual file entries (.dll, .pdb, .pdbx, .pe, .xml) with a single wildcard targeting lib\netnano1.0

<!-- Before -->
<dependencies>
  <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.35" />
</dependencies>
...
<file src="...\System.Device.I2c.Slave.dll" target="lib\System.Device.I2c.Slave.dll" />
<file src="...\System.Device.I2c.Slave.pdb" target="lib\System.Device.I2c.Slave.pdb" />
<!-- ...etc -->

<!-- After -->
<dependencies>
  <group targetFramework=".NETnanoFramework1.0">
    <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.35" />
  </group>
</dependencies>
...
<file src="System.Device.I2c.Slave\bin\Release\System.Device.I2c.Slave.*" target="lib\netnano1.0" />

Follows the pattern established in nanoframework/System.Device.Adc@aab7bca.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Update nuspec to place library under nano TFM</issue_title>
<issue_description>### Details about task
Most of the nuspec files are not using the correct location to place the files.
Files (DLL, PE, PDBX and XML for IntelliSense) should be placed under "lib\netnano1.0" (currently are being placed under "lib" only.
Also they should declare a dependency group for ".NETnanoFramework1.0" target framework.
At the same time those still naming the various file types should use a wildcard instead (e.g. "...\Release\mscorlib.*).
The correct pattern should be (take this nuspec as sample):
nanoframework/System.Device.Adc@aab7bca

Do not change anything else on the nuspec file.

Description

</issue_description>

Comments on the Issue (you are @copilot in this section)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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