Stop printing Protobuf message and its metadata in logs

[jeyhun]

Added String() method to ProtoStoreMsg, which will print out only ID, org. ID, instance ID, revision, and table name.

---

Before:

Unable to locate record [record=&{Id:P4 Msg:[] ParentId: Revision:0 OrgId:Pepsi InstanceId:Americas CreatedAt:0001-01-01 00:00:00 +0000 UTC UpdatedAt:0001-01-01 00:00:00 +0000 UTC DeletedAt:{Time:0001-01-01 00:00:00 +0000 UTC Valid:false} XTableName:processor}, dbName=testprotostoreindbcrud]
	record not found

---

After:

Unable to locate record [record={"id":"P4","revision":0,"org_id":"Pepsi","instance_id":"Americas","x_table_name":"processor"}, dbName=testprotostoreindbcrud]
	record not found

This resolves issue #42

[codecov-commenter]

Codecov Report

Merging #52 (a118699) into main (9b232f3) will decrease coverage by 0.10%.
The diff coverage is 33.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   70.56%   70.47%   -0.10%     
==========================================
  Files          12       12              
  Lines        1410     1419       +9     
==========================================
+ Hits          995     1000       +5     
- Misses        328      329       +1     
- Partials       87       90       +3     

Flag	Coverage Δ
unit-tests	70.47% <33.33%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
pkg/protostore/protostore.go	68.28% <33.33%> (-0.45%)	⬇️

[krishnamiriyala]

@jeyhun If it is used in logging add sample log for reference

[jeyhun]

@jeyhun If it is used in logging add sample log for reference

I've changed the PR's description to include a string version of an error generated by ProtoStore, which will include the JSON.
I haven't made the consumers of multi-tenant-persistence-for-saas use this change, so can't include consumers' logs.

[krishnamiriyala]

Lets fix the example for readability separately.