Emit the error code and type to the tracing span for inbound calls

[deepanshumehndiratta]

Changelog

1. Emit the error code and type to the tracing span for inbound calls

Description

This change adds the error type and code (for system errors) to the tracing spans for inbound requests.

[CLAassistant]

All committers have signed the CLA.

[codecov[bot]]

Codecov Report

Patch coverage: 71.79% and project coverage change: +0.10% :tada:

Comparison is base (0c11cc2) 88.78% compared to head (f3409ca) 88.89%. Report is 5 commits behind head on dev.

:exclamation: Current head f3409ca differs from pull request most recent head 51344aa. Consider uploading reports for the commit 51344aa to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #903 +/- ## ========================================== + Coverage 88.78% 88.89% +0.10% ========================================== Files 43 43 Lines 4440 4510 +70 ========================================== + Hits 3942 4009 +67 Misses 379 379 - Partials 119 122 +3 ``` | [Files Changed](https://app.codecov.io/gh/uber/tchannel-go/pull/903?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber) | Coverage Δ | | |---|---|---| | [outbound.go](https://app.codecov.io/gh/uber/tchannel-go/pull/903?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber#diff-b3V0Ym91bmQuZ28=) | `87.86% <33.33%> (+0.72%)` | :arrow_up: | | [messages.go](https://app.codecov.io/gh/uber/tchannel-go/pull/903?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber#diff-bWVzc2FnZXMuZ28=) | `91.58% <50.00%> (-6.27%)` | :arrow_down: | | [inbound.go](https://app.codecov.io/gh/uber/tchannel-go/pull/903?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber#diff-aW5ib3VuZC5nbw==) | `79.51% <61.53%> (-2.88%)` | :arrow_down: | | [mex.go](https://app.codecov.io/gh/uber/tchannel-go/pull/903?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber#diff-bWV4Lmdv) | `75.42% <76.00%> (+2.91%)` | :arrow_up: | | [connection.go](https://app.codecov.io/gh/uber/tchannel-go/pull/903?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber#diff-Y29ubmVjdGlvbi5nbw==) | `88.39% <88.88%> (+3.40%)` | :arrow_up: | | [relay.go](https://app.codecov.io/gh/uber/tchannel-go/pull/903?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber#diff-cmVsYXkuZ28=) | `85.77% <100.00%> (+0.06%)` | :arrow_up: | | [relay\_messages.go](https://app.codecov.io/gh/uber/tchannel-go/pull/903?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber#diff-cmVsYXlfbWVzc2FnZXMuZ28=) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/uber/tchannel-go/pull/903/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber)

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