fix: added cleanup of previously instance before creating new one

[Shahroz16]

Due to lifecycle differences, multiple instances of the application lifecycle would be added. So we need to unregister old instances of callbacks and also garbage collect any other instance of before.

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[codecov]

Codecov Report

Merging #185 (dd14915) into fix/android-12-opened-metrics (a410e6d) will increase coverage by 0.60%.
The diff coverage is 100.00%.

@@                         Coverage Diff                         @@
##             fix/android-12-opened-metrics     #185      +/-   ##
===================================================================
+ Coverage                            63.52%   64.13%   +0.60%     
- Complexity                             218      227       +9     
===================================================================
  Files                                   91       91              
  Lines                                 2051     2158     +107     
  Branches                               263      284      +21     
===================================================================
+ Hits                                  1303     1384      +81     
- Misses                                 646      671      +25     
- Partials                               102      103       +1     

Impacted Files	Coverage Δ
sdk/src/main/java/io/customer/sdk/CustomerIO.kt	78.02% <100.00%> (+3.86%)	⬆️

... and 1 file with indirect coverage changes

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[github-actions]

Build available to test
Version: shahroz-lifecycle-cleanup-SNAPSHOT
Repository: https://s01.oss.sonatype.org/content/repositories/snapshots/

[mrehan27]

LGTM 👍🏻