app:service: convert to dep injection

[compscidr]

Previously the code was untestable in certain places because the SessionManager used a enum / static singleton pattern. This has been fixed and some tests have been implemented for the new method.

Addresses: #4

[codecov]

Codecov Report

Merging #5 (6254a48) into main (1587f3d) will increase coverage by 8.66%.
The diff coverage is 45.00%.

@@             Coverage Diff              @@
##               main       #5      +/-   ##
============================================
+ Coverage     34.98%   43.64%   +8.66%     
- Complexity       84      100      +16     
============================================
  Files            23       23              
  Lines           826      811      -15     
  Branches         85       84       -1     
============================================
+ Hits            289      354      +65     
+ Misses          533      454      -79     
+ Partials          4        3       -1     

Impacted Files	Coverage Δ	Complexity Δ
...in/java/network/grape/service/GrapeVpnService.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ain/java/network/grape/service/SessionHandler.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ain/java/network/grape/service/SessionManager.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...in/java/network/grape/service/SocketProtector.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../network/grape/service/SocketDataReaderWorker.java	7.79% <60.00%> (+1.21%)	1.00 <1.00> (ø)
.../network/grape/service/SocketDataWriterWorker.java	9.52% <60.00%> (+1.45%)	1.00 <1.00> (ø)
...src/main/java/network/grape/service/VpnWriter.java	100.00% <100.00%> (+75.58%)	28.00 <4.00> (+16.00)

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