Updated Tokenchain Keys

[maneeSHA-256]

This PR is

1. updating the token chain keys from numeric values to meaningful words.
2. removing unrequired and duplicate keys
3. updating max decimal points in dump tokenchain from 5 to 3

Link to dump token chain of all kinds of tokens in Rubix : new token chains of all assets

Old Keys

    ```
    TCTokenTypeKey          string = "1"
TCTransTypeKey          string = "2"   // renamed as TCBlockTypeKey
TCTokenOwnerKey         string = "3"
TCGenesisBlockKey       string = "4"
TCTransInfoKey          string = "5"
TCQuorumSignatureKey    string = "7"
TCPledgeDetailsKey      string = "8"
TCBlockHashKey          string = "98"
TCSignatureKey          string = "99"
TCBlockContentKey       string = "1"
TCBlockContentSigKey    string = "2"
TCDataKey               string = "9"
TCTokenValueKey         string = "10"
TCChildTokensKey        string = "11"
TCInitiatorSignatureKey string = "12"

    GBTypeKey string = "1"     // removed : duplicate of TCTransTypeKey
GBInfoKey string = "2"

    GITokenLevelKey         string = "1"    // removed : unrequired
GITokenNumberKey        string = "2"   // removed : unrequired
GIMigratedBlkIDKey      string = "3"    // removed : unrequired
GIPreviousIDKey         string = "4"    // removed : unrequired
GIParentIDKey           string = "5"
GIGrandParentIDKey      string = "6"    // removed : unrequired
GICommitedTokensKey     string = "7"
GISmartContractValueKey string = "8"    // removed : duplicate of TCTokenValueKey
GINetworkIDKey          string = "networkID"

    TISenderDIDKey      string = "1"
TIReceiverDIDKey    string = "2"    // removed : duplicate of TCTokenOwnerKey
TICommentKey        string = "3"
TITIDKey            string = "4"
TIBlockKey          string = "5"
TITokensKey         string = "6"
TIRefIDKey          string = "7"
TIDeployerDIDKey    string = "8"
TIExecutorDIDKey    string = "9"
TICommitedTokensKey string = "10"
TIPinningDIDKey     string = "11"

    TTTokenTypeKey       string = "1"
TTPledgedTokenKey    string = "2" // depreciated not used
TTPledgedDIDKey      string = "3" // depreciated not used
TTBlockNumberKey     string = "4"
TTPreviousBlockIDKey string = "5"
TTUnpledgedIDKey     string = "6"
TTCommitedDIDKey     string = "7"

    PDTokenKey        string = "1"
PDTokenTypeKey    string = "2"
PDTokenBlockIDKey string = "3"

### New Keys
      ```
  TCTokenTypeKey          string = "tokenType"
	TCBlockTypeKey          string = "blockType"
	TCTokenOwnerKey         string = "tokenOwner"
	TCGenesisBlockKey       string = "genesisBlock"
	TCTransInfoKey          string = "transInfo"
	TCQuorumSignatureKey    string = "quorumSignature"
	TCPledgeDetailsKey      string = "pledgeDetails"
	TCBlockHashKey          string = "blockHash"
	TCSignatureKey          string = "signature"
	TCBlockContentKey       string = "blockContent"
	TCBlockContentSigKey    string = "blockContentSig"
	TCDataKey               string = "data"
	TCTokenValueKey         string = "tokenValue"
	TCChildTokensKey        string = "childTokens"
	TCInitiatorSignatureKey string = "initiatorSignature"
	TCEpochKey              string = "epoch"
	TCVersionKey            string = "version"

        GBInfoKey string = "genesisInfo"

        GIParentIDKey       string = "parentID"
	GICommitedTokensKey string = "commitedTokens"
	GINetworkIDKey          string = "networkID"

	TISenderDIDKey      string = "senderDID"
	TICommentKey        string = "comment"
	TITIDKey            string = "txnID"
	TIBlockKey          string = "block"
	TITokensKey         string = "transTokens"
	TIRefIDKey          string = "refID"
	TIDeployerDIDKey    string = "deployerDID"
	TIExecutorDIDKey    string = "executorDID"
	TICommitedTokensKey string = "commitedTokens"
	TIPinningDIDKey     string = "pinningDID"

	TTTokenTypeKey       string = "tokenType"
	TTBlockNumberKey     string = "blockNumber"
	TTPreviousBlockIDKey string = "previousBlockID"
	TTUnpledgedIDKey     string = "unpledgedID"
	TTCommitedDIDKey     string = "commitedDID"

	PDTokenKey        string = "pledgeToken"
	PDTokenTypeKey    string = "tokenType"
	PDTokenBlockIDKey string = "tokenBlockID"

[gklps]

lgtm