wallets with custom walletstores as backends

[anonsachin]

As the Wallet struct's store field is unexported it cannot be set outside the gateway package. This pull request adds a simple function to make it possible to have a custom WalletStore's.

[codecov]

Codecov Report

Merging #230 (2df1292) into main (cbdc79f) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #230      +/-   ##
==========================================
- Coverage   76.16%   76.15%   -0.02%     
==========================================
  Files         193      193              
  Lines       14075    14077       +2     
==========================================
  Hits        10720    10720              
- Misses       2387     2388       +1     
- Partials      968      969       +1     

Impacted Files	Coverage Δ
pkg/gateway/filesystemwallet.go	71.79% <100.00%> (ø)
pkg/gateway/wallet.go	88.88% <100.00%> (+0.42%)	⬆️
pkg/util/concurrent/lazycache/lazycache.go	88.34% <0.00%> (-1.95%)	⬇️

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[anonsachin]

As the Wallet struct's store field is unexported it cannot be set outside the gateway package. If attempted will get the following error

implicit assignment to unexported field store in gateway.Wallet literal

@andrew-coleman #185 this was the last pull request we had this discussion but I deleted that code hence I created a new one

[troyronda]

@andrew-coleman

[anonsachin]

Hi,

There were a lot of changes merged into the codebase after the v1.0.0 release. But the pkg in the go docs page is still at v1.0.0 as the latest - Doc's.

can we bump up the version to something like v1.1.0 to make the changes more accessible to people using the package?

otherwise, they will have to do the following command which can be inconvenient and not a good way to keep track of the package in their codebases.

go get github.com/hyperledger/fabric-sdk-go@e8663655affacfe1448c1450ecef11e1c5703aa4

I have also raised an issue regarding this - https://github.com/hyperledger/fabric-sdk-go/issues/228 .
@troyronda and @andrew-coleman is it possible to do this?